Thermocouples

A thermocouple is an electrical apparatus that can generate a current proportional to the amount of heat it is exposed to. In electrical engineering and industry, thermocouples are a widely used type of temperature sensor[1] and can also be used as a means to convert thermal potential difference into electric potential difference.They are cheap and interchangeable, have standard connectors, and can measure a wide range of temperatures. The main limitation is accuracy; System errors of less than one kelvin (K) can be difficult to achieve.