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Old 03-14-03, 07:54 AM   #2 (permalink)
Edwin's Avatar
Join Date: Jul-2002
Location: Ontario, Canada
Posts: 2,355
I am just guessing, but for analog hygrometers, there is a piece of metal (or something) that contracts and expands depending on the amount of humidity it is exposed to. The contractions and expansions move the pointer on the hygrometer.
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