A pair of different Thermocouple wires ( e.g. ) Ni - Cr, Ni - Al, Iron - Constantan, Copper - Constantan, NICR - Constantan etc ( As per DIN - 43760 Standards ) is made in twin flat or round form to make Thermocouple leads being used for accurate temp. measuring and controls. The wires may be designed and manufactured as per customers specific requirements. What is thermocouple wire? Thermocouple wire is a cable made from two dissimilar metals for the purpose of measuring temperature. Thermocouple wire is typically used to connect a thermocouple to a sensing device