Kestrel 0802 RH Calibration Kit at $65.99, The large container is used to create a stable environment. The small containers are used to hold the saturated salt solution. The saturated salt solutions generate well-defined humidities when they are confined to a contained environment.
Features:
Keeps your Kestrel meter accurate
Large container creates a stable environment
Small containers used to hold the saturated salt solution
Saturated salt solutions generate humidities when confined to contained environment