W. A. Hammond Drierite Relative Humidity Indicator Card, 6 Levels for 10% to 60% RH

Relative humidity indicator cards show moisture presence by changing color from blue to pink. This 10% to 60% RH card has six spots corresponding to 10, 20, 30, 40, 50, and 60% RH that change individually as humidity reaches each level. The card can be reused by placing it in a dry environment until it returns to blue. Changes color when moisture content rises; Indicates relative humidity within desiccating chambers; Six indicator levels from 10% to 60% RH; Reusable after drying