: Thermocouple is a metalic bar that can be used to measure the temperature of a place. Thermocouple is an analog sensor. It is used to measure temperature. In thermocouples thermo or tharmal means temperature and couple means pair. In this thermocouple , two different metals are stuck together and paired . Thermocouple will be 0 millivolts or short in the first case. After giving the temperature, the value will gradually increase. The thermocouple has two terminals, one positive and the other negative. It is measured in meter voltage mode.