How does the EasyCare CalCheck® work?

The EasyCare CalCheck® is a salt solution that generates a consistent relative humidity (when at a consistent temperature). It works in conjunction with the Rapid RH® Bluetooth® Smart Reader and either the (free) CalMaster app or the (paid) DataMaster™ app. These apps provide the necessary documentation of calibration checks required by the ASTM standard. Specifically, the F2170 Standard requires users to verify, at least 30 days prior to each usage, that the RH 5.0 sensor is within the accuracy parameters as set by the F2170 standard.