Humidity Indicator Cards - 3 Spot

from 1.60

Reversible & constantly indicates relative humidity
30%, 40%, 50% indicator spots
2” x 3” card

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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