An integral part of a complete moisture barrier packaging assembly is the Humidity Indicator Card. High relative humidity can cause significant, possibly irreparable damage to sensitive equipment, supplies, and products. To ensure dehydration measures work, humidity indicator cards measure the relative humidity (RH) inside sealed packages to allow immediate visual inspection of whether it has sustained unsafe humidity levels.

The Humidity Indicator Card contains chemically impregnated, humidity sensitive, indicating spots that will change color with moisture. The comparison bar is used to determine the relative humidity of the air. Select the indicating spot that most closely matches the color of the comparison bar. The measured relative humidity is the percentage indicated on the matching spot. The chemical reaction of the indicating spots is completely reversible; the spots will continue to change color as the moisture levels change. The Humidity Indicator Cards chemistry formula involves a cobalt compound, but no sulfur compounds.

Humidity Monitor cards are sold in cans. Humidity Indicator Cards should be inserted and sealed within a Moisture Barrier Bag with the desiccant packs.

Note: The complete dry package concept of packaging for electronics requires three elements:

• Moisture Barrier Bags – to protect
• Desiccants – to absorb moisture
• Humidity Indicator Cards – to monitor performance