Temperature probe to determine the U-value with triple sensor technology for measuring the wall temperature. To measure surface temperature, the three wires of the probe are attached to the inner wall using the supplied modelling clay.

To calculate the U-value, the outside temperature and room air temperature are required in addition to the surface temperature of the inside wall. With the radio probes (consisting of a radio handle and attachable temperature probe heads), these temperatures can be determined quickly and easily and transmitted to the testo 635.