Humidity Indicator Cards

Humidity indicators cards provide a quick and inexpensive means of checking relative humidity (RH) levels of your storage or display area. As humidity changes, the chemically impregnated spots change colour from blue (dry) to lavender (normal) to pink (humid). The standard card indicates the current humidity level. Priced per pack of 5 cards. Size: 110 x 38mm

6931-3100 Humidity Indicator Card Pkg/5
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