Frequently Asked Questions

Please review the list found here:

3rd Party Hardware and Software

We have created quick start guides for connecting to each of these below:

Vortex Fury 5000 AB Instructions

Vortex Fury 5000 AB Video Tutorial:

Kestrel 5 Series 3rd Party Hardware Connection Instructions

How to connect a Bushnell 1800 Nitro to a Kestrel 5700 unit   (Size: 110.2 KB)

This guide will help with connecting a Kestrel 5700 and Bushnell 1800 Nitro rangefinder.

Locked issue with Sig 5K or 10K Laser Rangefinders   (Size: 523.7 KB)

This document shows how you can unlock the connection issue between a Sig 5K or 10K and a Kestrel 5700 weather meter

Using a Bushnell CONX with a Kestrel 5700   (Size: 538.1 KB)

A quick start guide to connecting a Bushnell CONX rangefinder with a Kestrel 5700 Ballistics or Elite.

Using a Leica CRF Rangemaster 3500.com with a Kestrel 5700   (Size: 104.6 KB)

A quick start guide to connecting a Leica CRF Rangemaster 3500 with a Kestrel 5700 Ballistics or Elite.

Using a Leica Rangemaster 2800 with a Kestrel 5700   (Size: 104.8 KB)

A quick start guide to connecting a Leica Rangemaster 2800 laser rangefinder with a Kestrel 5700 Ballistics or Elite.

Using a Sig Sauer 2400BDX or 3000BDX with a Kestrel 5700   (Size: 88 KB)

A quick start guide to connecting a Sig Sauer 2400BDX or 3000BDX with a Kestrel 5700 Ballistics or Elite LiNK unit

Using a Steiner M830r with a Kestrel 5700   (Size: 538.1 KB)

A quick start guide to connecting a Steiner M830r with a Kestrel 5700 Ballistics or Elite LiNK unit

Using a Terrapin X with a Kestrel 5700   (Size: 2.2 MB)

A quick start guide to connecting a Terrapin X with a Kestrel 5700 Ballistics or Elite LiNK unit.

Using a Vectronix PLRF25C with a Kestrel 5700   (Size: 106 KB)

A quick start guide to connecting a Vectronix PLRF25C with a Kestrel 5700 Ballistics or Elite LiNK unit.

Using a Wilcox RAPTAR-S with a Kestrel 5700   (Size: 423.6 KB)

A quick start guide to connecting a RAPTAR-S with a Kestrel 5700 Ballistics or Elite LiNK unit.

Please check out our Kestrel 5000 Firmware change log to view the differences in the various firmware versions: Firmware Change Log

Due to differences in barrel machining, muzzle breaks, propellants and other factors, when the same bullet is fired from different rifles there will be a slight difference in the drag the bullet will experience. The Hornady 4DOF solver assumes the bullet will be fired from an "average" barrel but in reality your rifle may impact the bullet slightly differently. To account for any differences the Axial Form Factor value can be modified to align the output from the solver to what your bullet is experiencing. By firing at a known target and adjusting the Axial Form Factor value till the predicted solution matches real world results, you can calibrate the solver to match your rifle and bullet and deliver even more accurate firing solutions. Axial Form Factor can be calibrated using a target anywhere from 300 to 800 yards away and impacts the solution through the supersonic, transonic, and subsonic flight of the bullet.

Zero range is the distance from the muzzle to where a straight line following the axis of your scope crosses the flight path of the bullet. The scope is typically adjusted so this crossing point happens at 100yds but can be set further out. Because the flight path of the bullet can be impacted by changes in environmental conditions, the distance to that crossing point can vary with altitude or changes in the weather, notably if longer distance zero ranges are used. Zero Angle on the other hand is a measure of the angle between the straight line following the axis of the scope and the straight line following the axis of the rifle barrel. This angle is very small and would be difficult to measure directly but the 4DOF ballistics engine can find the angle when provided with environmental data and bullet impact location. Once the solver knows the Zero Angle between your rifle and scope a very accurate solution can be provided regardless of how long the zero range is or how much the weather changes. Read more about the Hornady 4DOF ballistics engine.

Zero Angle is available but it is not the default option. To find Zero Angle in your Kestrel, enter the gun menu and scroll down to Zero Range (ZR) and press the center button. In the Rifle Zero sub menu, highlight Zero Range and toggle left or right. Zero Range will change to Zero Angle and a Calibrate Zero Angle command will appear below it. Selecting Cal Zero Angle will open the Zero Angle Calculator tool.

In the Kestrel LiNK Ballistics app, enter the Gun Profile Editor where you build profiles and tap the Zero Range field name in yellow. In the pop up you will see an option to switch to use Zero Angle.

Because not all laser rangefinder manufacturers use the Kestrel Ballistics Bluetooth Protocol to talk to a Kestrel, the Hornady Kestrel cannot communicate with some rangefinders which can talk to our existing ballistics meters. Check out this page to find the latest updates on which will connect with a Kestrel 4DOF unit: 3rd Party Devices

If you have a laser rangefinder with Bluetooth LE which you would like to have communicate with one of our Kestrel meters please contact the manufacturer and ask them to implement the Kestrel Ballistics Protocol in their rangefinder.

When calculating Zero Angle, the Hornady Kestrel asks for the distance to the Zero Target. This distance can be any distance you want but you’ll want to pick a distance where you’ll be able to accurately measure the distance between your point of aim and average point of impact with no elevation dialed or held when shooting. 100 yards or meters is a convenient distance and may be close to where your rifle is already zeroed.

Note: Just because your shooting range says a berm is at 100 yards, you should still confirm that distance with an accurate laser rangefinder or 100 yard tape measure.

After entering the Zero Angle sub menu, select Cal Zero Angle and then follow the prompts to enter the required data for your shooting environment and target. When shooting at your zero target, make sure your scope turrets are dialed to zero elevation, don’t hold any elevation in your reticle and place the cross-hairs directly on the target (point of aim). After firing enough shots to be confident of your average point of impact, measure the distance between your point of aim and average point of impact. Enter this value in the Cal Zero Angle calculator field asking for the Impact Height at Target, (impacts above the point of aim are positive and below are negative). After calculating the Zero Angle, press Exit and when prompted, accept the Zero Angle value.

Please ensure privacy pin is not turned on. On the Kestrel, go to Main Menu->Bluetooth and press the center button. Then highlight Privacy Pin and turn off with left or right arrow. After doing this, try running the update again.

Here is a list of the changes for Kestrel firmware version 1.49

Sight Scale Factor - For Scope Corrections   (Size: 156.9 KB)

Here is a tutorial on entering Sight Scale Factor (SSF) also known as a scope correction factor into the Kestrel.

It will depend on if you want to integrate just the weather data or both the weather and ballistics data. If you need the ballistics (and/or weather) data, please send an email with a high level description of the project to Tech Support Email.
If you just need the weather data protocol, you can fill out our Technology Agreement found here: Kestrel Technology Agreement

Please try refreshing the cache on the webpage. To do this, press Ctrl-F5. If that does not work, then please try opening the order in an incognito window (Shift-Ctrl-n) . For MAC users on Safari, you can use [CMD] + [ALT] + [E]

No the DROP will not connect with the Kestrel LiNK Ballistics app. The app does not have a ballistic solver in it so you need to have a 2700 or 5700 in order for it to work correctly. However there are other 3rd party apps that will work with the DROP. Here is a list of them: 3rd Party Apps

Please check out our tutorial:

Support Documents for all Kestrels

Kestrel 5000 Series Bluetooth Guidance   (Size: 656.1 KB)

Find answers to common Bluetooth connection issues

Please see this guidance:

Kestrel 5700 with Hornady 4DOF Downloads

How to Calculate your Axial Form Factor   (Size: 111.2 KB)

Guidance on how to properly adjust your Axial Form Factor

Please see this navigation diagram for the Kestrel 5700 Elite

Kestrel Ballistics 5 Series Troubleshooting Documents

Kestrel 5700 Elite Button Diagram / Navigation Tree   (Size: 222.6 KB)

This guide will show the button presses to access all the various menus and submenus on the Kestrel 5700 Elite unit.

Please try this as a workaround:

Troubleshooting reconnection issues with compatible laser range finders   (Size: 355 KB)

Here is a workaround if you are having issues with the Kestrel 5700 and a LiNK compatible rangefinder reconnecting.

Please try this guidance shown here:

Fixing Connection Issues with an iPhone or iPad with Kestrel LiNK Ballistics   (Size: 560.8 KB)

This guide will show a common workaround to assisting with connecting your Kestrel 5700 series unit with the Kestrel LiNK Ballistics app on an iPhone or iPad.

Please see the guidance shown here:

Locked issue with Sig 5K or 10K Laser Rangefinders   (Size: 523.7 KB)

This document shows how you can unlock the connection issue between a Sig 5K or 10K and a Kestrel 5700 weather meter

The two links below will provide you will all the details you need to get started using your Kestrel Ballistics meter.

• A step-by-step Guide to Getting Started Using Your Kestrel
• Getting started with a Kestrel Ballistics meter Video Series

In general, there should be no special treatment needed for 22 LR compared to traditional rifle bullets if they are not being damaged during feeding. Since 22 LR projectiles are generally constructed of plated lead, they are soft and can deform easier than a traditional copper jacketed bullet during feeding or handling. If this is the case, I can believe that there would be observed differences between prediction and actual point of impact. 4DOF will handle any normal projectile dynamics that exist due to possible projectile dynamic instability that may occur at low mach numbers (transonic / subsonic).

Unfortunately, some 22 LR projectile shape’s are more prone to having dynamic instability issues than traditional copper jacketed projectiles. If the dynamic instability is severe enough (dependent upon shape, mass layout, twist, and angle of attack), it becomes impossible to predict the effects from a point of impact standpoint. Based on what I have observed with the RADAR it is possible that 22 LR projectiles will experience dynamic instability that will result in erratic point of impact results after certain time of flights that will not be able to be corrected by the shooter. The shooter is looking for a trend, I’m always hitting high or always hitting low to be able to troubleshoot, identify, and fix a problem that exists between the ballistic prediction and the observed point of impact. Unfortunately though, if impacts at 300 yds with a 22 LR are “all over the map”, this cannot be fixed by a ballistic solver.
The recommended process with rimfire would be the same as any centerfire system.

1. Measure and input an accurate muzzle velocity.
2. Ensure all inputs are correct pertaining to the rifle and bullet picked from the library.
3. Conduct the find zero angle process.
4. Shoot at distances equating to time of flights of .5-1.3 seconds (100-350 yds for most 22 LR). If there is a difference between the point of aim and point of impact, conduct the axial form factor calibration to account for the difference observed.
... Permalink

Here's a video that shows how to calibrate the compass and has some troubleshooting tips as well: Compass Calibration ... Permalink

Please see this link: Garmin Help

"All measurements not available in all units"

Temperature Functions

For best accuracy when taking temperature measurements you must keep the air moving around the temperature sensor and keep the Kestrel out of prolonged, direct sunlight. If there is a strong breeze, just point the Kestrel into the wind. If there is no wind, swing the Kestrel around in a circle on its lanyard or rapidly wave it back and forth in hand. This ensures that the sensor measures the temperature of the air rather than the temperature of the case. Alternatively, if you have time, allow the Kestrel to rest where you want to measure the air temperature (NOT in your hand or in direct sunlight if there is no wind) until the case temperature equalizes with the air temperature. When equalized, the display will read a constant value. Be aware that this could take a few minutes, particularly if there is no wind.

Humidity Functions

One reason your Kestrel may not be reading accurate ambient humidity is because of proximity to humidity sources such as your hand, your body or the ground. Avoid covering the large humidity chamber opening on the case rear with your fingers. Keep all fingers below the finger groove and away from the chamber opening. Do not take reading that rely upon humidity with the Kestrel meter lying flat – raise it into the air vertically or stand it on its base and orient it into the wind or air flow. If a high level of accuracy is required for measurements involving humidity, do not hold the unit while taking measurements. Taking readings with the Kestrel in your hand or over your body can raise relative humidity by 5% or more. A Kestrel vane mount will isolate the Kestrel Meter from erroneous humidity influences and keep it oriented into the wind or air flow while taking measurements. Whenever you move your Kestrel Meter into a new environment wait until the primary sensor values have stabilized (Temperature, Humidity, etc.) before taking measurements that rely upon these values. After a large change in environmental condition, this may take 15 minutes or more, with humidity potentially taking the longest. If the humidity sensor housing (located above the rear label) is wet, the Kestrel cannot take an accurate humidity reading. If the sensor does become wet, shake the unit vigorously to remove the water, and then let it dry completely before use. If the sensor comes in contact with salt water, rinse it thoroughly with clean water, then shake it and allow it to dry. As is typical with humidity sensors, it is possible for the humidity sensor in the Kestrel to drift over time as described in the spec sheet. If your unit has a Humidity recalibration function, it can be returned to the factory or used with the Kestrel RH Calibration Kit to recalibrate its humidity readings.

Wind Meter Functions

Wind speed is highly dependent on surrounding obstructions such as buildings, yourself and the ground, with wind speeding up as it flows around and over obstacles and slowing down as it passes behind them. Even in an open area, Wind speed will be slower near the ground so ensure you are taking measurements at an appropriate height for your application. Hold the back of the unit directly into the wind. Holding the unit off-axis by 5° will reduce accuracy by 1%, 10° will reduce accuracy by 2% and 15° will reduce accuracy by 3%. Using a Kestrel Vane Mount will ensure the unit is correctly oriented into the wind and measuring accurate wind speeds. The Kestrel impeller housing can rotate in the unit. For best accuracy, ensure one of the three “arms” of the impeller housing is pointing straight up. The wind speed displayed by the Kestrel Meter is a 3 second rolling average. This allows the unit to provide a value that is more representative of the typical, ambient conditions but not capture peak speeds for instantaneous blasts of air.

Compass Functions

The compass in the Kestrel Meter is used for direction, crosswind, headwind/tailwind as well as for capturing various user inputs based on direction. When calibrating and when using the compass, it is important to hold the unit as vertically as possible. Any tilt in angle present when the unit is calibrated or when measurements are taken will negatively impact the accuracy of the compass reading. Many users will inadvertently tilt the Kestrel Meter away from themselves slightly when holding the unit. If a high level of accuracy is required, using a Kestrel vane mount on a leveled tripod for calibration and measurement can eliminate error.

Pressure Functions

All pressure and altitude measurements are made using the pressure sensor. Some units have a dedicated “Pressure” screen which shows Station Pressure, the raw pressure reading straight from the sensor. The Barometric Pressure measurement (Baro) displays the local Barometric Pressure using the Station Pressure measurement adjusted to the local altitude using the Reference Altitude value input by the user. The Altitude measurement displays the local altitude using the Station Pressure measurement combined with the Reference Baro value input by the user. To obtain an accurate barometric pressure or altitude readings, you must first know EITHER your location’s current barometric pressure OR your current altitude. If the Reference Altitude value is incorrect, the Barometric Pressure reading will also be incorrect. If the Reference Barometric pressure value is incorrect, the Altitude reading will also be incorrect. Because Barometric Pressure and Altitude are each dependent on the alternate reference value remaining constant, Barometric Pressure and Altitude cannot be accurately measured simultaneously. If your unit has a pressure recalibration function, a new Barometric Pressure calibration value may be input. If this value was not taken from a verified source (a local airport or weather station) with the Kestrel being calibrated at the same location as the reference device, pressure related measurements may be incorrect.

WBGT

When changing environments (such as moving form an air conditioned room to outdoors or removing the unit from your pocket) the unit requires between 8-15 minutes to equilibrate to its surroundings before taking readings. Take measurements at least 3 feet off the ground and in the same wind or air flow conditions as the people you are monitoring. Ensure the Kestrel is oriented into the wind and able to measure the full wind value. A tripod or pole mount and the Kestrel Rotating Vane Mount are ideal for ensuring accurate measurements. Differences in the reflectivity of ground surfaces such as grass or asphalt will impact measurements. Be sure to take measurements in the same solar/radiant heat environment as the people you are monitoring. Unlike best practices for other measurements, WBGT is intended to be taken in direct sunlight. As long as there is occasional wind the Kestrel has software that allows it to maintain an accurate WBGT reading despite being placed in direct sunlight.

Air Flow

Kestrel Professional Meters can calculate air flow through a duct by combining user input information about the size and shape of the duct with the measured air velocity. In addition to reading the instantaneous Air Flow off the main measurement screen, a more accurate result may be obtained by capturing an average air flow on the Min/Ave/Max screen while traversing the duct. Traversing consists of dividing the area of the duct into evenly sized sections and averaging the air flows at the center of all sections. By spending an equal amount of time at each measurement location and quickly moving between measurement locations, the average air flow measurement can provide a more accurate measure of the air flow in the duct. Capturing an average can be particularly helpful when measuring ducts with registers or dimensionally uneven air flow.

Evaporation Rate

(Kestrel 5200 Professional Environmental Meter) Kestrel Professional Meters can calculate a concrete evaporation rate (ACI 308) by combining a user input concrete temperature with measured air temperature, wind speed and relative humidity. Concrete mix temperature is generally measured with a probe or infrared thermometer and should be read at the time of making the evaporation rate measurement After inputting the mix temperature, hold the unit vertically, approximately 20 inches above the surface of the concrete while facing the rear of the unit directly into the wind. To avoid inaccurate Evaporation Rate readings due to thermal loading it is best to shade the Kestrel. (Be sure the source of shade is not obstructing the wind speed measurement.) The ACI recommends taking a 6-10 second average of the evaporation rate to account for fluctuating wind speeds. To measure an average Evaporation Rate, scroll right from the Evaporation Current Measurement Screen to the Min/Ave/Max Screen and press select to manually start and stop a capture.

The attached link will help with determining average wind direction and the use of a wind rose. The documents would be pertinent to any of the 5500 models, especially important for spray drift and measurements in the protected zones.

Kestrel 5 Series Downloads

How to I determine the average wind direction?   (Size: 837 KB)

The attached document in Excel will help with determining average wind direction and the use of a wind rose by using the exported CSV file. This would be pertinent to any of the 5500 models, especially important for spray drift and measurements in the protected zones.

Please see our guidance in this tutorial on Accy 1st features:

Tutorial on Accuracy 1st menu options for the Kestrel 5700 Elite   (Size: 2.7 MB)

This is a quick guide that shows you how to use the Accuracy 1st menu options for the Kestrel 5700 Elite (fw 1.35 or higher needed)

The bore height used for all 2700 profiles is 2.00 inches. This should be close enough to give a valid solution for the majority of scopes out there

Please see this guidance

Changing Direction of Fire and have Wind Direction Change   (Size: 147.6 KB)

This tutorial will show you how you can now change DOF and have your Wind Direction change. This setting can be found in all 5700s with firmware version 1.41 (or higher).

Yes. You can use the red "capture" button to easily delete letters and the backlight button to add blank spaces to the names.

It sets the following:

• Latitude = 0
• DoF = 0
• WD = 3:00
• WS1 = 0mph
• WS2 = 4mph
• SpinDrift = OFF
• HCor = OFF
• IDeg = 0
• Enviro = LOCKED
• BL Auto-Cal = ON
• Range Card user column = Wnd2

Please see the guidance shown here:

Target Estimation Shortcuts with Kestrel 5700   (Size: 221 KB)

This document shows how to estimate either Target Range or Target Speed by just using your Kestrel 5700 and your scope.

You will first need to create an account if you do not already have one. After you create an account, sign in. Click on your account name at the top of the page and select My Account. On the left of the screen, you will see Product Registration, select this option. Enter your purchase date, serial number and product name into the fields and then select Save.

Typically this will happen if the Kestrel is placed near a magnet or magnetic source. Things such as the MagnetoSpeed Riflekuhl or other chamber chillers, electronic hearing protection, or maybe even magnetic buttons on your pocket. Any magnet can affect the compass calibration. Also storing the Kestrel in a metallic enclosure such as a gun safe can have an affect on the compass calibration.

No. You can only pair the Kestrel to the Kestrel LiNK Ballistics app as a one-to-one connection. You can connect to a laser rangefinder and the Kestrel HUD simultaneously however.

Once you turn on the MV temp table, the MV will automatically change in direct correlation with the values input into the table as data points. If your ammo is at a different temp than ambient environmental temps, either colder or warmer, turn the MV temp on and then go to environment and change the environment temp to match the ammo temp. This automatically changes the MV in the gun profile to match the ammo burn rate variability at whatever temperature it is based off the data points you have input into the table. Then turn the temp table to OFF. Then go back and update the environment to capture current atmospherics. By turning the table off prior to updating to current atmospherics, we lock in the MV associated with the burn rate of the powder at whatever the temp of the ammo is, and then by updating we get the atmospherics required for ballistic calculations.

Please see the guidance shown here:

How to capture Wind Direction and Wind Speed for all Targets in a Sector   (Size: 476.7 KB)

This will show you how to automatically or manually capture wind direction and speed for all the Targets at once.

Please see this guide on how to update your Kestrel Firmware using Windows:

Kestrel 5 Series Troubleshooting Documents

How to Update Kestrel 5000 Series Firmware with Windows   (Size: 573.5 KB)

Tutorial on how to update your Kestrel 5000 series firmware using LiNK for Windows.

Please see this guide for updating Kestrel 5000 series units with MAC/OSX:

Kestrel 5 Series Troubleshooting Documents

How to Update Your Kestrel 5 Series Firmware with MAC/OSX   (Size: 821.1 KB)

Tutorial on how to update your Kestrel 5000 series firmware using LiNK for MAC/OSX

Please see this guide:

Kestrel 5700 with Hornady 4DOF Downloads

How to Connect a Kestrel 5700 with Hornady 4DOF to Kestrel LiNK Ballistics App   (Size: 227.9 KB)

Quick guide on connecting a Kestrel 5700 with Hornady 4DOF to the Kestrel LiNK Ballistics App

Please see this guide:

Kestrel 5700 with Hornady 4DOF Downloads

How to Create and Transfer Bullet Files with Kestrel LiNK Ballistics App   (Size: 444.1 KB)

Quick tutorial on how to create and transfer gun profiles for Kestrel Hornady 5700 4DOF units

Please see this guide here:

How is Bullet Length Calculated?   (Size: 1.1 MB)

A quick diagram of how to measure bullet length

Make sure on the Kestrel you go into Environment and set Wcap to All Targets instead of One Target

We changed the way that the rifle twist is entered with firmware 1.20 and higher. If you have an 11 inch rifle twist, please enter this as 1:11.00 in. This is read as a 1 rotation in every 11 inches of barrel travel. Previously this was just entered as 11.00 in. If instead you have a 9 inch twist, it would be entered as 1:9.00 in.

Please see our guide here:

Kestrel 5 Series Troubleshooting Documents

How to View and Control Kestrel Data Remotely   (Size: 336.9 KB)

This gives a method for viewing and remotely controlling the Kestrel using two mobile devices.

If you are getting NaN shown as a solution, then you have a bad value in your gun profile. For instance, the bullet length is set to 0.000. This also confirms that you have an older version of the firmware as later versions will check for these conditions before loading the gun on the unit. Check your profile and update your firmware to resolve this issue. If you are getting Bad Enviro as a solution, then there is an issue with one of the sensors. If the issue persists, then there might be a sensor failure. The best course of action is to fill out a Kestrel Service request and send it in.

Var is going to be the magnetic declination of your current location, further information can be found here: Magnetic Declination
Var is not used when selecting Magnetic North. If you choose True North, then it is advisable to add the Var number.
To find your magnetic declination, here is a good place to start Find my Var

Please see the attached guidance for more information on this product

Contains Ruger Kestrel 5700 Ballistics gun and ammo information and Ruger gun wizard tutorial   (Size: 1.2 MB)

Document shows all the current Ruger guns and ammunition for the Ruger Kestrel 5700 Ballistics along with a tutorial on how to use the Ruger Gun Wizard.

Kestrel runs free Zoom training classes throughout the year on different topics. Check out the latest classes HERE

For live training at a shooting site, you can check out some of these options

• Accuracy 1st - Canadian, TX
• Altus - Baker, FL
• Mile High - Fort Morgan, CO
• FTW Ranch - Barksdale, TX

The Kestrel 2700 can only hold 1 gun profile at a time. You can store as many profiles in the Kestrel LiNK Ballistic app as you want however.

The Kestrel 2700 only supports 1 target at a time.

No, the Kestrel LiNK Ballistics app is needed to create a profile and load it on the Kestrel 2700.

If the Kestrel reads “CAL CPS”, then you will need to calibrate the compass prior to using. To do so, press the center button when CAL CPS is on the screen. Spin and the number 30 will appear on the screen. Hold the Kestrel vertical and rest the bottom of the Kestrel on a table or your hand and rotate the Kestrel in place until the number reaches 0. You can spin the Kestrel in either direction but it is recommended not to spin too fast or you can get a bad calibration.

The Kestrel 2700 is always advertising its Bluetooth signal so you just need to turn it on. You should NOT pair the 2700 directly to your device’s main Bluetooth screen. First, make sure Bluetooth is turned on on the mobile device. You would then just need to open the Kestrel LiNK Ballistics app and go to Connect Device. Your unit with serial should be showing on the screen, press it to start the connection.

The Kestrel 2700 uses Applied Ballistics Lite as the ballistic solver.

We have replacement battery doors we can send you. Please see this link: Replacement Doors

Battery life will depend on Bluetooth usage. Typical usage without using the app frequently should get 130 hours of battery life. Battery life goes down drastically when connect to the app and live streaming the wind values, especially in colder temperatures.

This program only runs on Windows platforms. For 5700 units, it is required to use our USB connection cable to use this program

Applied Ballistics Profile Loader - Version 083   (Size: 6.4 MB)

This program is used to transfer gun profiles to and from a Kestrel ballistics unit and Windows computer. 4500 Ballistic models can use either Bluetooth or the PC Interface cradle but must have fw version 4.93. 5700 models must use the USB Transfer cable to connect. Instructions included in zip file.

Make sure Bluetooth^® is turned ON on your phone. On the Kestrel, go to the Main Menu->Bluetooth and turn it ON. Press the center button while Bluetooth is highlighted and check to ensure that Conct is set to PC/Mobile and it shows Available. Next go to the application that you are connecting with on your phone and select the Kestrel as the device you would like to connect with. Please note: if you do not find the Kestrel on your phone’s “standard” Bluetooth connection screen, that does not mean that the Kestrel is not working properly. Please first go to the application and try to connect through the application. The Kestrel should connect.

The Kestrel 2700 has an 875 yards max range.

No. The Kestrel 2700 only works with the Kestrel LiNK Ballistics application.

No, the Kestrel 2700 can only connect with the Kestrel LiNK Ballistics application and will not connect with any other accessories.

1. After calibrating the compass, use the left or right arrow buttons to set the range. Holding the button will make the range increase quicker.
2. Press the center button to enter environmental capture. Swing or wave the Kestrel to get airflow over the sensor. Once the temperature stabilizes press the center button again.
3. Next is the direction of fire screen. Point the back of the Kestrel towards your target and press the center button to do a capture.
4. Wind direction and speed follows. Point the back of the Kestrel directly into the prevailing wind. Make sure you capture at least 10 seconds of wind in this direction and when satisfied press the center button to end capture.
5. If inclination was set in the app, enter your inclination angle using the directional arrows.

You can now upgrade your Kestrel 5700 to the Elite version using the Kestrel LiNK Ballistics application. Simply connect your Kestrel to the iOS or Android version of the Kestrel LiNK Ballistics app. Select Upgrade in the top left corner. Enter you credit card information for the purchase and the upgrade should start after payment is completed. The upgrade will look similar to a firmware update.

Please see our guide found here:

Kestrel Ballistics 5 Series Troubleshooting Documents

How to calibrate a 22 Long Rifle using a Kestrel Elite   (Size: 134.7 KB)

This document shows how to calibrate using CalMV and CAL DSF a 22 Long Rifle or other guns which do not shoot supersonic region.

Please see this diagram which shows the difference and why drop is always the bigger value

Difference between Max Ord and Bullet Drop   (Size: 199.6 KB)

This diagram shows the difference in the Max Ordinate value and the Bullet Drop value found on the Kestrel 5700.

Please see this guidance on changing units for the Kestrel 2700

How do I change the units on my Kestrel 2700?   (Size: 94.9 KB)

This document shows a quick guide on how to change the units for a Kestrel 2700.

Please see this issue for Kestrel 2700 units that aren't turning on

Why won't my Kestrel 2700 power on?   (Size: 395.7 KB)

This document shows why some units may not power on, especially after changing the battery.

Applied Ballistics is now adding personal gun profiles to their bullet library. When choosing a profile, select the standard name of the profile without parentheses...if it the profile has a (name/characters) after it, it is someone's personal profile. For instance pick Berger Target Hybrid not Berger Target Hybrid(BW1402S)

This document will show the details of what the Maximum Point Blank Range function does in the Kestrel 5700 Elite (fw version 1.35 or later, Elite ONLY)

What is Maximum Point Blank Range?   (Size: 287.4 KB)

Firmware 1.35 add maximum point blank range for the Kestrel 5700 Elite models, this document explains what exactly this feature does.

The Kestrel 2700 will power off after 45 minutes of inactivity however this does not apply when connected via Bluetooth to the Kestrel LiNK Ballistics app

All models of the Kestrel 5000 Series have optical data ports that can be seen through the openings of the battery door. A USB Data Transfer Cable can be purchased separately, which plugs directly into the back of the Kestrel and extends to a USB port in your computer.  You will NOT be able to connect a non-LiNK model unit to a mobile device (e.g., any device without a USB port).

These programs handle uploading the weather data from the Kestrel to a specific device. This weather data can then be exported into MS Excel. You can also update your firmware any of these programs. Visit the Kestrel LiNK Software and Apps page to learn more.

As can be seen in the pictures below, place your thumb on the bottom of the unit and slide the latch from the “Locked” to the “Unlocked” position. The battery door should pop up enough that you can remove it. If you have trouble opening the battery door, some slight pressure DOWN on the battery door itself with your other thumb may help release the latch.

First slide in the tab at towards the top of the unit, then gently press the bottom part of the battery door down until it snaps into place.  Ensure that the O-ring remains in place on the battery door when closing.

No. Since the Kestrel 5 Series meters utilize only one AA battery, there is no need to use the battery shim to separate two AAA batteries as in the previous version.

Yes. And you can now upgrade your Kestrel 5700 to the Elite version using the Kestrel LiNK Ballistics application. Simply connect your Kestrel to the iOS or Android version of the Kestrel LiNK Ballistics app. Select Upgrade in the top left corner. Enter you credit card information for the purchase and the upgrade should start after payment is completed. The upgrade will look similar to a firmware update.

No. Currently ONLY the Kestrel Sportsman Weather Meter with Applied Ballistics or the Kestrel 5700 Ballistics Weather Meter can be upgraded to the Kestrel 5700 Elite model.

All of the Kestrel 5000 series units have the Night Vision option in addition to the standard white backlight.  There is a menu selection that allows the customer to toggle between both options.

Yes. You can always trade-in an older Kestrel, regardless of its condition, by using our Customer Trade-In Program.

The Kestrel 5 Series models can store over 10,000 data sets.

Wind Speed – NK sells factory calibrated replacement impellers that can easily be installed by the customer. NK recommends replacing the impeller every 2-3 years depending on usage.

Humidity – The Kestrel 5 Series and DROP data loggers employ a highly accurate, calibrated, digital humidity sensor. Based on the sensor manufacturer's specifications and NK testing, drift on this sensor over time is minimal and field recalibration is likely to degrade accuracy rather than improve it. Factory calibration to validate and certify accuracy at a minimum of two RH points is available from NK. Kestrel 5000 series units can also be recalibrated in the field using our kit RH Recalibration Kit . During the five-year warranty period, NK will repair, recalibrate or replace any Kestrel 5 Series or DROP which drifts more than +/-1% RH/year since the date of manufacture.

Temperature – The thermistor in the Kestrel 5 series should not need to be recalibrated. If you think your sensor is incorrect, please contact techsupport@nkhome.com

Pressure – The pressure in the Kestrel 5 series should not need to be recalibrated. If you think your sensor is incorrect, please contact techsupport@nkhome.com

Kestrel 5 series units with LiNK will need to use the Kestrel LiNK Wireless Dongle to connect with a computer. The Kestrel 5 series will not work with any internal Bluetooth modules. To connect, insert the Kestrel LiNK Dongle into an open USB port. On the Kestrel, go to the Main Menu->Bluetooth and turn it ON. Set Conct to "PC / Mobile." Open the application on the computer and select the Kestrel as the device to connect to. There is no more “pairing," "COM port numbers," or "PIN Codes" to worry about for those familiar with the 4000 series.

Please see our graphing guide:

Berry compliant means that any of the textiles used in the product are sourced and made in the U.S.A.

For Kestrel 4500 Ballistic and 5700 Ballistic meters, the ballistics calculator will ALWAYS use station pressure despite the altitude number that is entered.

• If you want station pressure, set your reference altitude to ZERO on the Baro screen (4500 Series) or just view the Pressure screen (5000 Series).
• If you want your altitude to display correctly and have station pressure, you will need to enter your current barometric pressure as the reference barometric pressure. The reference altitude should remain ZERO, and Sync Alt should be OFF.

Yes! The Kestrel 5 Series now has both Android and iPhone integration through our Kestrel LiNK iOS and Android Apps. Kestrel LiNK iOS and Android apps allow LiNK enabled Kestrel 5 Series Meters and DROPs to connect wirelessly with mobile devices to view real-time measurements, receive on-screen alerts, download data and perform firmware updates. The Kestrel LiNK Ballistics app, designed specifically for the the Sportsman , the Kestrel 5700 series or meters, and the Kestrel 5700 Elite meters, provides full gun management and access to the Applied Ballistics library of G1/G7 curves (Sportsman and 5700) and custom drag models (5700 Elite).

For overall setting up profiles and using the Kestrel please see the following document:

Kestrel Ballistics 5 Series Instruction Manuals

How to Get Started with your Kestrel Ballistics Unit   (Size: 184.7 KB)

A 10 step guide to setup your Kestrel to work with your gun.

Any of the LiNK Ballistics applications will allow you to transfer gun profiles to your Kestrel. So Kestrel LiNK Ballistics for iOS or Kestrel LiNK Ballistics for Android will allow you to use a mobile device to transfer gun profiles but you would need to have the LiNK (i.e., Bluetooth) model. If you are using a Windows computer, you can use the Applied Ballistic Profile Loader (Version 42 or higher).

NOTE : Please be aware that currently the Applied Ballistics Profile Loader cannot be used with Bluetooth for Kestrel 5700 devices; therefore you will need to purchase the USB Transfer cable to transfer files with a Windows PC.

Unfortunately we do not have a ballistics application that runs on a MAC.

The free Kestrel LiNK Ballistics app for Android and iOS is the ideal companion to the Kestrel 5700 Ballistics series of Weather Meters. Build and manage your gun/bullet profiles and download them to your Kestrel Ballistics unit before you set out. The app is also the perfect way to display your ballistic solutions remotely via Bluetooth. Another option is purchasing a Kestrel HUD

You can now upgrade your Kestrel 5700 to the Elite version using the Kestrel LiNK Ballistics application. Simply connect your Kestrel to the iOS or Android version of the Kestrel LiNK Ballistics app. Select Upgrade in the top left corner. Enter you credit card information for the purchase and the upgrade should start after payment is completed. The upgrade will look similar to a firmware update.

View this document to learn how to transfer gun profiles from 4500 to Kestrel 5 Series

See chart below:

You should always calibrate your Muzzle Velocity on the Kestrel because it accommodates for any errors. The suggested BCs are not always correct. We have seen a lot of muzzle velocity errors even with well chronographed MVs. Truing bends the algorithm to perfectly match the bullet’s flight path. Instead of hoping the prediction works, truing perfectly matches the flight path. For example, the ballistic solver expects different muzzle velocities depending on if you are using the G1 or G7 BC. However the chronograph is just measuring the actual muzzle velocity coming out of the barrel, independent of an BCs being used. Truing your Muzzle Velocity using CAL MV will always get you the proper MV to enter into the Kestrel so that your solutions are always on target.

There is no need to input the tapered base into the Kestrel.  If you measure scope height at the bell of the scope, the most your error will be is 1 – 2 clicks at 1000 yards. This can be offset by measuring to the center of the windage turret instead of the bell of the scope.  It is more likely that the scope click errors will do more harm than this will. Here is some reading that might help: http://www.longrangehunting.com/forums/f19/applied-ballistics-faq-167008/.

The true distance to target should be entered, as reported by a laser range finder or whatever other means the operator is using to get range to target. See below:

Read our guide to Getting Started with Long Range Shooting

Please click here to see our 3rd party applications

Please click here to see our article regarding the Applied Ballistics Profile Loader

The free Kestrel LiNK Ballistics app is the perfect companion to the Kestrel Sportsman, Kestrel 5700 Ballistics Weather Meter, Kestrel 5700 Elite Weather Meter with Applied Ballistics, Kestrel 5700 Ballistics Weather Meter with Hornady 4DOF, or Kestrel 2700 Ballistics Weather Meter. Build and manage your gun/bullet profiles and download them to your Kestrel Ballistics Meter before you set out. At the range or match, secure your Kestrel Ballistics Meter to a tripod using the optional Kestrel Vane Mount and use the LiNK Ballistics app to quickly adjust the target range and direction of fire and view the shooting solution and wind rose without leaving your shooting position. It’s like having a meteorologist and ballistician standing next to you while you shoot.

Download Kestrel LiNK Ballistics for iOS:

LiNK (Kestrel)

Kestrel LiNK Ballistics for iOS  

The Kestrel Ballistics app for your Apple iOS device.

Quick Look

• Wirelessly adjust the target range and/or direction of fire on your Kestrel and view the resulting elevation and windage solution without ever leaving your shooting position.
• Build and transfer custom gun/bullet profiles.
• Comprehensive Applied Ballistics bullet library provides G1/G7 ballistics coefficients, weight, diameter, and length data for over 500 bullets.
• Comprehensive Hornady Bullet Files that include the bullet's mass properties, aerodynamic moments, and Doppler Radar determined drag coefficients (Kestrel 5700 4DOF only)
• With Kestrel Elite Meters, also access and use Applied Ballistics Custom Drag Models, providing exact drag profiles for supersonic, transonic, and subsonic bullet flight for maximum accuracy at extreme long range.
• Advanced Target Card view allows you to simultaneously view the elevation and windage solution for up to 10 targets defined by direction, range, and angle - giving you the edge at precision rifle matches (available for Kestrel Elite only).
• Export your customized target card to save or print out.
• Use your phone's compass to capture a new direction of fire, wind direction, or inclination angle and send it to the Kestrel.

Example Screen Shots

	See elevation and windage solutions as well as wind speed and direction without leaving your shooting position. Changing Target Range and/or Direction of Fire in the app automatically updates the solution from the Kestrel remotely.
	Input up to 10 separate target ranges to see elevation and windage solutions for each. Perfect for competition multi-target stages.
	Create and manage gun and bullet profiles for easy upload to and from your Kestrel. Includes bullet data from the Applied Ballistics G1/G7 bullet library.

Kestrel Firmware:

Support Documents for all Kestrels

Kestrel 5000 Firmware Update Change Log   (Size: 583 KB)

Version 1.53/2.11

Device Compatibility:

• Firmware: iOS versions 10.0 and higher.
• Hardware: iPhone 4s onward, iPad 3rd generation onward, iPod Touch 5th generation onward.

Kestrel Compatibility:

• Kestrel Sportsman Weather Meter with Applied Ballistics with LiNK
• Kestrel 5700 Ballistics Weather Meter with LiNK
• Kestrel 5700 Elite Weather Meter with Applied Ballistics with LiNK
• Kestrel 5700 Ballistics Weather Meter with Hornady 4DOF
• Kestrel 2700 Ballistics Weather Meter

The free Kestrel LiNK Ballistics app is the perfect companion to the Kestrel Sportsman, Kestrel 5700 Ballistics Weather Meter, Kestrel 5700 Elite Weather Meter with Applied Ballistics, Kestrel 5700 Ballistics Weather Meter with Hornady 4DOF, or Kestrel 2700 Ballistics Weather Meter. Build and manage your gun/bullet profiles and download them to your Kestrel Ballistics Meter before you set out. At the range or match, secure your Kestrel Ballistics Meter to a tripod using the optional Kestrel Vane Mount and use the LiNK Ballistics app to quickly adjust the target range and direction of fire and view the shooting solution and wind rose without leaving your shooting position. It’s like having a meteorologist and ballistician standing next to you while you shoot.

Download Kestrel LiNK Ballistics for Android:

LiNK (Kestrel)

Kestrel LiNK Ballistics for Android  

Download the Kestrel LiNK Ballistics app from the google play store.

Quick Look

• Wirelessly adjust the target range and/or direction of fire on your Kestrel and view resulting elevation and windage solution without ever leaving your shooting position.
• Build and transfer custom gun/bullet profiles.
• Comprehensive Applied Ballistics bullet library provides G1/G7 ballistics coefficients, weight, diameter and length data for over 500 bullets.
• Comprehensive Hornady Bullet Files that includes the bullet's mass properties, aerodynamic moments and Doppler Radar determined drag coefficients (Kestrel 5700 4DOF only)
• With Kestrel Elite Meters, also access and use Applied Ballistics Custom Drag Models, providing exact drag profiles for supersonic, transonic, and subsonic bullet flight for maximum accuracy at extreme long range.
• Advanced Target Card view allows you to simultaneously view the elevation and windage solution for up to 10 targets defined by direction, range and angle - giving you the edge at precision rifle matches (available for Kestrel Elite only).
• Export your customized target card to save or print out.
• Use your phone's compass to capture a new direction or fire, wind direction, or inclination angle and send to the Kestrel.

Example Screen Shots

	See elevation and windage solutions as well as wind speed and direction without leaving your shooting position. Changing Target Range and/or Direction of Fire in the app automatically updates the solution from the Kestrel remotely.
	Input up to 10 separate target ranges to see elevation and windage solutions for each. Perfect for competition multi-target stages.
	Create and manage gun and bullet profiles for easy upload to and from your Kestrel. Includes bullet data from the Applied Ballistics G1/G7 bullet library.

Kestrel Firmware:

Support Documents for all Kestrels

Kestrel 5000 Firmware Update Change Log   (Size: 583 KB)

Version 1.53/2.11

Device Compatibility:

• Firmware: Android 5.0 and higher.
• Hardware: Most Android Devices with Bluetooth Smart®, including Samsung Galaxy, Nexus 4, Motorola Droid and other recent generation phones and tablets.

Kestrel Compatibility:

• Kestrel Sportsman Weather Meter with Applied Ballistics with LiNK
• Kestrel 5700 Ballistics Weather Meter with LiNK
• Kestrel 5700 Elite Weather Meter with Applied Ballistics with LiNK
• Kestrel 5700 Ballistics Weather Meter with Hornady 4DOF
• Kestrel 2700 Ballistics Weather Meter

Transfer data from your Kestrel 5 Series device and archive on your Mac computer. Data logs can be exported as csv files for viewing and analysis in spreadsheets. This software also facilitates updates and upgrades to your device firmware.

Download Kestrel LiNK for MAC:

LiNK (Kestrel)

Kestrel LiNK for OSX   (Size: 10 MB)

Kestrel LiNK Version 1.04.04 for OSX.

Quick Look

• Manage updates and upgrades to device firmware
• View device information such as device name, model number, firmware version, hardware version and serial number. Rename device.
• Transfer data from your Kestrel 5 Series device wirelessly with Bluetooth dongle or with a USB cable.
• Archive data logs.
• Export data logs in csv format for viewing and analysis in spreadsheets.

Example Screen Shots

	Easily connect your Kestrel to the application using bluetooth.
	Manage your Kestrel: change its name, download data, and/or update your unit.
	Export and analyze your data.

Kestrel Firmware:

Kestrel 5 Series Troubleshooting Documents

How to Update Your Kestrel 5 Series Firmware with MAC/OSX   (Size: 821.1 KB)

Tutorial on how to update your Kestrel 5000 series firmware using LiNK for MAC/OSX

Support Documents for all Kestrels

Kestrel 5000 Firmware Update Change Log   (Size: 583 KB)

Version 1.53/2.11

Kestrel 5 Series Downloads

Kestrel Firmware Installer for Windows   (Size: 16 MB)

Kestrel Firmware Version 1.49 Update Installer for Windows

Kestrel Firmware Update Files for OSX   (Size: 14 MB)

Kestrel Firmware Version 1.49 Update Installer for OSX. Please see included directions as this process has changed.

Device Compatibility:

• Firmware: This program is only compatible with Mac OS X 10.7 or higher.

Kestrel Compatibility:

• Kestrel 5000 Environmental Meter with LiNK
• Kestrel 5100 Racing Weather Meter with LiNK
• Kestrel 5200 Professional Weather Meter with LiNK
• Kestrel 5400 Heat Stress Tracker with LiNK
• Kestrel 5500 Weather Meter with LiNK
• Kestrel Sportsman Weather Meter with Applied Ballistics with LiNK
• Kestrel 5700 Ballistics Weather Meter with LiNK
• Kestrel 5700 Elite Weather Meter with Applied Ballistics with LiNK

Transfer data from your Kestrel 5 Series device and archive on your Windows computer. Data logs can be exported as csv files for viewing and analysis in spreadsheets. This software also facilitates updates and upgrades to your device firmware.

Download Kestrel LiNK for Windows:

LiNK (Kestrel)

Kestrel LiNK for Windows   (Size: 10.7 MB)

Kestrel LiNK Version 1.04.07 for Windows

Quick Look

• Manage updates and upgrades to device firmware
• View device information such as device name, model number, firmware version, hardware version and serial number. Rename device.
• Transfer data from your Kestrel 5 Series device wirelessly via the Bluetooth dongle or with a USB cable.
• Archive data logs.
• Export data logs in csv format for viewing and analysis in spreadsheets.

Example Screen Shots

	Easily connect your Kestrel to the application using bluetooth.
	Manage your Kestrel: change its name, download data, and/or update your unit.
	Export and analyze your data.

Kestrel Firmware:

Kestrel 5 Series Troubleshooting Documents

How to Update Kestrel 5000 Series Firmware with Windows   (Size: 573.5 KB)

Tutorial on how to update your Kestrel 5000 series firmware using LiNK for Windows.

Support Documents for all Kestrels

Kestrel 5000 Firmware Update Change Log   (Size: 583 KB)

Version 1.53/2.11

Kestrel 5 Series Downloads

Kestrel Firmware Installer for Windows   (Size: 16 MB)

Kestrel Firmware Version 1.49 Update Installer for Windows

Kestrel Firmware Update Files for OSX   (Size: 14 MB)

Kestrel Firmware Version 1.49 Update Installer for OSX. Please see included directions as this process has changed.

Device Compatibility:

• Firmware: LiNK is currently compatible with Windows 7, Windows 8, and Windows 8.1 and Windows 10.

Kestrel Compatibility:

• Kestrel 5000 Environmental Meter with LiNK
• Kestrel 5100 Racing Weather Meter with LiNK
• Kestrel 5200 Professional Weather Meter with LiNK
• Kestrel 5400 Heat Stress Tracker with LiNK
• Kestrel 5500 Weather Meter with LiNK
• Kestrel Sportsman Weather Meter with Applied Ballistics with LiNK
• Kestrel 5700 Ballistics Weather Meter with LiNK
• Kestrel 5700 Elite Weather Meter with Applied Ballistics with LiNK

Bluetooth Support:

Every single Kestrel Meter and Kestrel DROP logger is factory tested to validate performance within specifications before it leaves our factory. We don’t rely on spot checks because we know you rely on your Kestrel to give you the accurate readings you need to stay safe, make decisions, and enjoy your activities. Each of our calibration standards is traceable to the National Institute of Standards and Technology (NIST), ensuring the highest level of reliability. Our wind/airflow standard is actually calibrated in the NIST laser doppler wind tunnel as this is the only lab in the country that can provide the calibration accuracy we require.

NK offers three types of calibration services to meet your accuracy validation needs. Each of these calibration services can be conveniently ordered through our website, allowing you to cross “Get my Kestrel calibrated” off your to-do list whenever convenient. And, ordering your calibration online creates an order history you can refer to in future. But, if you prefer, you can always call or chat with us during business hours to order your calibration. For more in-depth information about each of the services described below, simply click through to the relevant ordering page.

NIST Calibration Services

NIST Calibration is our most in-depth calibration service. The Kestrel’s measurements are compared to our NIST-traceable standard at two points after an appropriate equilibration period. The NIST Calibration Report and Certificate will show as found and as left values, standard values, acceptable range, and deviation. It will also list the date, serial number and model of the unit, desired recalibration interval, and test technician’s name and signature. NIST Calibration services can be added on to any new Kestrel purchase for customers who require it, or you may return your Kestrel to us at any time after purchase to validate its performance in detail. Please visit our Kestrel Calibration product for more information.

Factory Calibration Services

For Factory Calibration we repeat the tests performed on your unit when it was manufactured and provide a renewed Sensor Calibration Certificate confirming performance within specification, the serial number of the unit, and the signature of the testing agent. Please note that if you need more than one Factory Calibration, Tune-Ups offer a better value! Please visit our Kestrel Calibration product for more information.

Tune-Up Services

Tune-Ups include Factory Calibrations of all sensors on your unit as well as a new impeller, new battery, functional checks, cleaning and leak testing. Tune-Ups are priced at a flat $75 per unit so offer a great value if you need more than one Factory Calibration or just want to ensure your Kestrel is fully tested.

Note on Sensor Correction: If needed and available for the sensor in question, we will also restore your unit’s performance to specification by either replacing the impeller or correcting the sensor. Although not correctable, in our experience, both the temperature sensor (ambient and globe) and newer humidity sensor in the DROP and Kestrel 5 Series have proven extremely stable in performance. Every Kestrel is guaranteed to perform within specification, including the specified drift of the sensor in question, for Five Years from the date of manufacture or documented date of first customer purchase. If your Kestrel is under warranty and does not meet this standard under test, it will be repaired or replaced as covered under the terms of our Limited Warranty. If your Kestrel has an unrepairable problem and is no longer under warranty, you have the option of trading it in for a new or upgraded model under our Kestrel Trade-in, Trade-up Program. Please visit our Kestrel Tune-up product for more information.

Shipping Your Unit: After ordering a calibration or tune-up service online or via phone, please note your order number so you can add it to the outside of the box. Please pack your Kestrel securely and ship to:

Nielsen-Kellerman
21 Creek Circle
Boothwyn, PA 19061
Attn: ORDER####

You will also receive an email confirming these instructions. It is most important that we have your Order Number so we can promptly match your unit with your service request. You can also print your order confirmation and add it to the box.

Questions or clarifications about our calibration services? Email techsupport@nkhome.com or call (610) 447-1555.