Living Climate hygrometer-thermometer in brass housing

Hygrometer used to measure the relative humidity and is based on the hygroscopic properties of hair or synthetic fibers, which change their length with change in humidity.

While natural hair can also be used at temperatures below 0 ° C, react hygrometer with synthetic fibers in this temperature range extremely sluggish and are therefore not recommended for use outdoors, since with decreasing air temperature increases the inertia of the synthetic fiber.

Hair hygrometer require regular regeneration (time interval: a few weeks), with hygrometers with synthetic fibers, this is generally not necessary.