A thermocouple is a sensor that measures temperature. It consists of two different types of metals, joined together at one end. When the junction of the two metals is heated or cooled, a voltage is created that can be correlated back to the temperature. Thermocouples are commonly used in a wide range of applications. Thermocouples are manufactured in a variety of styles, such as thermocouple probes, with connectors, transition joint thermocouple probes, bare wire thermocouples or even just thermocouple wire