130 mm hair hygrometer

This 130 mm hair hygrometer is a meteorological instrument that allows you to understand the relative atmospheric humidity through hair analysis.

Hair is hygroscopic, i.e. it tends to retain moisture around it. This absorption causes a change in its length, depending on the humidity to which it is subjected. It will be this change in length that will allow the hygrometer to perceive the humidity.

This Hygrometer is suitable for school use, while learning concepts related to meteorology. The sensitivity of the instrument can be increased by removing oils from the hair, for example with the aid of Ethyl Ether.