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A hair-hygrometer (gold color) is a hygrometer which makes use of the qualities of hair.
A degreases hair or bundle of hair does have the characteristic to grow when the relative humidity rises and shrink when the relative humidity decreases.
The variation in length is being transferred to a display by a leveraging effect. This is how an indication is obtained of the relative humidity.
Reality shows that a hair hygrometer is more accurate than a digital hygrometer.
The hair-hygrometer comes with a manual and is best hang in the vicinity of your instrument. You can choose in color between gold and silver.