The RF/B-1W indoor sensor in modern housing design measures the temperature in the range of -30 up to +60°C in gasiform medium and converts the measured value into a digital output signal. The resolution of the conversion is configurable from 9-bit to 12-bit (0,5/0,25/0,125/0,0625 K). The 1-Wire protocol allows a cost efficient wiring of multiple sensing devices as series, ring or tree topology in 2- or 3-wire connection. Optionally, each device has a serial number label, whereby a quick and easy start-up is possible. The temperature probe can be mounted directly on-wall by 2 fixing screws. The extra large air vents ensure an optimal ventilation as well as a high measurement accuracy.