HI-1 - Single Level Humidity Indicator Card

This single colour-change Humidity Indicator Card is Cobalt Chloride Impregnated and housed inside a printed envelope.

The card changes from Blue (Dry) to Pink (Wet) and commonly used in packaging application as a visual indication of rising Relative Humidity Levels.

The envelope is printed with instructions and also a colour chart to aid reading.

• Humidity Indicator Cards