1 9/16 x 4 3/4" 10-20-30-40-50-60% Humidity Indicators

Small paper instruments designed to monitor humidity levels.

• Helps provide visual proof of the relative humidity within a sealed package or given environment.
• Color changes from blue to pink as humidity levels increase.
• The 3 dot cards are recommended to monitor electronic equipment or optical instruments and the 6 dot card is for all-purpose use.