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 new Kestrel 4400 and Kestrel 4600, but they need to be put in upside down to fit (black globe first).
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 approximately 13 hours, including setup and calibration.