These humidistats provide accurate humidity control for indoor air quality systems, according to the manufacturer.

These humidistats provide accurate and reliable humidity control for indoor air quality systems, according to the manufacturer. A sensor in the HR-1 is made of human hair. When the relative humidity of the surrounding air increases, the length of the hair increases, and vice versa. The change in length is transferred to a micro-switch or slide-wire potentiometer.

Regin HVAC Products, 273 Canal St., Suite 222, Shelton, CT 06484; (800) 394-2739.