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High relative humidity (RH) can cause significant, possibly irreparable damage to sensitive equipment, electronics, semiconductors, and supplies. Humidity Indicator Cards (HICs) measure the relative humidity inside sealed packages to allow immediate visual inspection of whether it has sustained unsafe humidity levels.

HICs are printed with moisture sensitive spots which respond to various levels of humidity with a visible color change from dry color to wet color.

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.