Humidity indicator card
Revision as of 13:27, 27 April 2013 by (username removed)
Description
A paper card used as a general indicator of humidity. A humidity indicator card contains several small discs of absorbent paper impregnated with varying proportions of cobalt chloride. Anhydrous cobalt chloride is blue and the hydrated salt is pink. The discs change color according to the atmospheric humidity and provide an general level of relative humidity ranging from 10 to 100 %. Temperature can affect the readings; high temperatures may cause the card to indicate a humidity lower that what is actually present.
Synonyms and Related Terms
Hydrio [University Products]; Feuchteindikatorpapier (Deut.)