A thermocouple is made up of of two dissimilar conductors in contact with one another, which produce a voltage when heated.  Thermocouples are used as temperature sensors for measurement and control and can also be used to convert a temperature gradient into electricity.

这款 J型热电偶 （铁-铜镍合金）是一种常见、通用型热电偶，其温度范围为−40°C至+750 °C，灵敏度为55 µV/°C。电线颜色标准为白色（+）与红色（-）。