The calibrateable room humidity radio sensor KYMASGARD® RFTF-FSE, accuracy class ± 3 % r.H., measures the relative humidity and temperature of air and transmits the measurement signal via radio frequency to the receiver, which converts the signal and outputs it as 0 - 10 V, RS-485, or as switching contact. It is used to detect the humidity in closed rooms, in apartments, in office and business facilities. Wireless technology applied by KYMASGARD® RFTF-FSE saves wiring effort, installation time, cables and installation materials and enables flexible positioning at measuring points in arbitrary locations.