hair hygrometer

noun
a hygrometer actuated by the changes in length of a strand of human hair brought about by changes in the relative humidity.

Origin:
1875–80

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Also, a hair hygrometer needs frequent adjustment and calibration.
Since hair becomes longer on humid days and shorter on dry days, these changes in length are recorded using the hair hygrometer.
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