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Types of Thermocouple Extension Cable and Wire—ZMS Industrial Supply Thermocouple cables are used to connect thermocouples to measuring instruments. Therefore, it must be made of the same material as the thermocouple. Otherwise, the extra thermocouple voltage will eventually lead to distorted measurement. The products are mainly used in various temperature measuring devices and have been widely used in nuclear power, petroleum, chemical, metallurgy, electric power, and other sectors.