Humidity Indicator Card 3 spot

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Humidity Indicator Cards are small, paper instruments designed to monitor relative humidity levels. These 3 spot cards are reversible and constantly indicate relative humidities as low as 30 percent and as high as 50 percent, they change from blue to pink

Description
Specifications

Cobalt series humidity indicator Cards 125 pcs

High sensitivity, accurate indication: Indicator containing CoC12 is very sensitive to humidity.
Obvious effects in color change: Cobalt containing series humidity indicator is blue when dry, and changes into pink after absorbing moisture, the contrast effect between different colors is very obvious.

Specifications:
MIL-I-8835A (00334)
Material: HM-03