These 4-spot humidity cards are specifically designed for use with moisture barrier bags. Place them inside each bag to measure the relative humidity (RH) inside, so you can quickly inspect humidity levels.
These 4-spot humidity cards are specifically designed for use with moisture barrier bags. Place them inside each bag to measure the relative humidity (RH) inside, so you can quickly inspect humidity levels.
Humidity Indicator Cards (HICs) are printed with moisture sensitive spots which respond to various levels of humidity with a visible color change from blue to pink. The moisture sensitive spots are made of blotting paper impregnated with cobaltous chloride. The humidity inside dry packed barrier bags can be monitored by including an HIC inside. When the bag is opened, the card can be examined for proper dryness inside the bag.
Features
| Materials | Blotting paper impregnated with cobaltous chloride |
| Accuracy | Based on ambient temperature of 75°F |
| Tolerance | Approx. 2.5% for each 10°F away from 75°F |
| Materials | Blotting paper impregnated with cobaltous chloride |
| Accuracy | Based on ambient temperature of 75°F |
| Tolerance | Approx. 2.5% for each 10°F away from 75°F |
