The room temperature sensor and measuring transducer THERMASGARD® FSTF-xx-PD4 is used for air temperature measurement, for setpoint adjustment, or as room control unit or operating panel with temperature sensor, turn switch and potentiometer in residential rooms or workshops, office and business facilities. Installation as in-wall version in connection with high-quality panel switch programmes, preferably with products by Gira, Busch-Jaeger, Berker, Merten, Siemens, or Jung. These room temperature sensors can be installed individually or in combination with light switches, socket outlets, or other in-wall devices.