KESTREL RH Calibration Kit (RH—calibrate humidity sensor) includes three clear, sealable containers; one container with magnesium chloride solution; one container with sodium chloride solution; two wooden scrapers; and an insulated carrying case to hold all of the above and maintain a stable environment while performing calibration. For use with Kestrel 4500, Kestrel 4200, Kestrel 4100, Kestrel 4000, Kestrel 3500, and Kestrel 3000 pocket wind meters.