This is a cobalt chloride free color-change reversible humidity indicator card that has 6 indicating spots 10/20/30/40/50/60-percent rh, they change from brown dry to pale green humid. This card complies with mil-1-8835. A great tool to assist you in keeping your valuables protected.
- This indicator card has 6 indicating spots,10/20/30/40/50/60-percent rh
- Humidity indicator cards - dots change color to reflect level of humidity
- Cobalt chloride free cards
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