A Ni/CrNi thermocouple, also known as a K type, consists of two wires. One wire is made of pure nickel, the other of a chromium-nickel alloy. At the closest point to the reference junction (to the connector) where the two wires touch, a thermoelectric voltage occurs due to the Seebeck effect. This is the measuring point. The voltage that occurs at the point of contact is temperature dependent. This voltage can then be converted into a temperature by a special evaluation device. The application range of such thermocouples is between 0 °C and 1100 °C, and they are accurate to within (+/-) 1.5 °C.

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