3M Humidity Indicator Cards

Variety of Sensitivities Lets You Accurately Monitor Humidity Levels in Your Packaged Goods

Moisture-sensitive spots on these Cards respond to various levels of humidity with a visible color change from blue to pink. Humidity Indicator Cards are used inside vacuum-sealed, dry-packed moisture barrier bags to monitor the interior humidity conditions of the package. When the bag is opened, you can examine the Card to verify the proper dryness inside the bag.
Specifications: Cards are performance tested and lot traceable. They are RoHS-compliant and lead-free.