Description
Fischer Hair hygrometer 20th century Diameter : 11 cm The hair hygrometer uses the property of horse hair or human hair to measure the humidity of the air. It lengthens or shortens when the hygrometry varies.
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Fischer Hair hygrometer 20th century Diameter : 11 cm The hair hygrometer uses the property of horse hair or human hair to measure the humidity of the air. It lengthens or shortens when the hygrometry varies.
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