Surface sensors are used for temperature measurement on round and flat surfaces. The dimensions of the PWF 9 temperature sensor, for example, are 8Ø x 25 mm, with a Ø 4.5 mm hole for an M4 fastening screw. The kink protection spring Ø 8 x 200 mm protects the connecting cable from damage. The standard version is manufactured with a connection line consisting of nickel-plated copper wire. The single cores have PFA and glass silk insulation and are braided together with glass silk and stainless steel wires.