Humidity Indicator Cards

These humidity indicators provide a quick and inexpensive means of checking relative humidity levels of your storage or display areas. As humidity changes the chemically impregnated spots change from blue (dry) to pink (humid). The card indicates the current humidity level, measures 4.5'' x 1.5'' and comes with a pressure sensitive backing. Can also be used in a sealed frame package to monitor humidity levels in framed artwork. Price per package of 5 cards.