This Humidity Indicator Card is a reversible color-change indicator. As the humidity increases, the chemically impregnated spots change from a blue color (DRY) through a lavender, to a pink color (HUMID). As the humidity level decreases, the spots change from a pink color (HUMID), through a lavender, back to a blue color (DRY).
Humidity Indicator Cards are packed in re-sealable containers with desiccant for an extended shelf life. Each of these cards are accurate to ±5% relative humidity (RH) at 75°F (24°C).
Other varieties are also available, some incorporate temperature indicators. Most can be printed with your company's special copy.
This card has an adhesive backing for securing to a surface.