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This indicator card has 3 indicating spots,30/40/50-percent rh
Humidity indicator cards - dots change color to reflect level of humidity
Cobalt chloride free cards
This is a cobalt chloride free color-change reversible humidity indicator card that meets the requirements of military specifications mil-1-8335 and mil-p-116 method ii.this indicator card has 3 indicating spots 30/40/50-percent rh, they change from brown dry to pale green humid. A great tool to assist you in keeping your valuables protected.