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Humidity Indicator Cards - 6 Spot

from 1.80

Reversible & constantly indicates relative humidity
10%, 20%, 30%, 40%, 50%, 60% indicator spots

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DESCRIPTION

Humidity Indicator Cards are small, paper instruments designed to monitor relative humidity levels. These 6 spot cards are reversible and constantly indicate relative humidities as low as 10 percent and as high as 60 percent, they change from blue to pink