Kestrel Meter Calibration Kit

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Vendor Kestrel

Please note, the calibration kit is currently unavailable due to manufacturing constraints. 

The RH (calibrate humidity sensor) calibration kit includes the following items:

  • three clear, sealable containers
  • one container with magnesium chloride solution
  • one container with sodium chloride solution
  • two wooden scrapers
  • an insulated carrying case to hold all of the above and maintain a stable environment while performing calibration
  • For use with: Kestrel 4500, Kestrel 4300, Kestrel 4200, Kestrel 4100, Kestrel 4000, Kestrel 3500, and Kestrel 3000 (Both the older 2 button and 4 button version)
  • Also for use with the Kestrel 4400 and Kestrel 4600, but they need to be put in upside down to fit (black globe first).
  • Please note, this kit cannot be used for the 5000 series meters

Field Recalibration
This Calibration Kit allows you to perform dozens of recalibrations in the field, to ensure that your Kestrel is always performing within specifications.  In fact, if using distilled water, you can calibrate an indefinite number of times. 
The manual explains in detail all of the steps for recalibrating your Kestrel. This process will take a couple days, including setup and calibration. 

Previous instructions required you to prepare the salt mixtures and then put the Kestrels into the container and run the routine. You must now allow the Kestrel sit in the container for 24 hours before running the first calibration routine.

After the first calibration routine is completed, you need to allow the Kestrel to soak in the second container for another 24 hours before performing the second part of the calibration routine. This will ensure the humidity levels are adequate and the customer should get much better results in the field, as we have found through testing.  We do not recommend doing more than 1 unit in the container at a given time.

Replacement Salt /Magnesium Chloride can be bought for your kits at any time.

Kestrel Calibration Kit Video:


Kestrel Calibration Kit Additional Information 

Domestic Shipping

FREE SHIPPING & RETURNS (on Meters) on orders over $50 in the USA. (USPS)

Free Return policy: Domestic meters can be ordered risk free for 30 days.  

If you would like to return it, simply email us and we'll email you a return label.  You will be responsible for packing, taping, and getting it to UPS or US mail service.  The meter must contain the original box and all that comes with it or there will be a restocking fee of up to 15%.  

We ship via USPS or UPS shipping. You may choose at checkout. 

International Shipping

Shipping outside the USA will have these options with prices at checkout:

  • First Class Mail for $10 on orders under $50 (intended for battery kits & screen protectors)
  • Priority Mail International:  $29 FLAT RATE (Limited Online Tracking)
  • USPS Express Mail: $49 FLAT RATE (Global Online Tracking)
  • UPS Expedited: 2-5 Business Days - Delivery by end of day
  • UPS Express: 1-3 Business Days - Delivery by end of day
  • UPS Saver: 1-3 Business Days - Delivery by end of day