The thermocouple is a temperature sensor with many applications used for contact temperature measurement. It is one of the constituent elements of the thermocouple temperature probe, a measuring device whose main elements are the sensor and a data reading device, generally having a liquid crystal screen. The thermocouple is one of the most widely used sensors, alongside RTDs (Pt100, Pt100, Pt1000 etc.) and the thermistor, whose resistance depends on temperature. The advantages of the thermocouple are its robustness, its affordable price, its reaction speed and its ability to measure over wide temperature ranges.