The mechanical room hygro-thermostat HYGRASREG® RHT (room hygrostat with (bimetal) temperature controller) is used for controlling and monitoring of relative humidity (humidifying and dehumidifying) and temperature in office and residential rooms, baths, winter gardens, labs, computer rooms, etc. HYGRASREG® RHT is applied in dust-free, pollutant-free, non-aggressive air.