The SCS 3HIC125 3-Spot Humidity Indicator Card (HIC) is printed with moisture-sensitive spots that respond to various levels of humidity with a visible color change from blue to pink. 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. This indicates that the barrier bag and desiccant functioned correctly.
The SCS (3M) 3HIC125 3-Spot Humidity Indicator Card is popular for military applications, and is approved for use by DOD, NATO, and governmental agencies for Method II packaging.