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A hygrometer.

A specialized version, using two thermometers, one dry and one wet, is called a "sling psychrometer"

2007-09-27 13:40:24 · answer #1 · answered by skeptik 7 · 0 0

It is most commonly named a hygrometer. Traditionally it was made with horse hair that was connected to a cylinder. The higher the relative humidity, the longer the hair is.

2016-05-20 02:42:10 · answer #2 · answered by ? 3 · 0 0

barometer

2007-09-27 13:11:51 · answer #3 · answered by Anonymous · 0 1

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