B b sensors ff glt 10v tept humidity sensor and pt1000 prt in wall housing b b sensors ff glt 10v tept this industrial standard humidity probe is designed to fit discreetly into a wall mounted housing to measure relative humidity a precise and stable polymer capacitive sensing element is used for temperature measurement there is a passive pt1000 platinum resistance thermometer prt that converts the measured temperature into a standard signal output the sensor is capable of continuous use