These color change humidity indicator cards were designed for use in desiccant containers in order to insure the desiccant is in a activated condition. These color change cards are fully reversible, pink indicted a desiccant failure. A blue color reference bar is printed at the bottom of the card as a guide. When a container of desiccant is opened the dot will match the bar if the desiccant is active.

Note: Humidity Range is not indicated on these cards.