Moisture indicator card for use with desiccant. Reversible. True Cobalt-free. Indicates that relative humidity is 10,20, 30, 40, 50 or above 60% by changing color from brown to blue-green, or in other combinations as shown on the card. Supplied in a metal box
6-spot 10-60% card 40x100mm. 250 per box Cobalt-free
