Greater stability, accuracy, repeatability in some cases than thermocouple cables, The product referenced above represent the most popular constructions. Other constructions can be manufactured to meet individual specification and application requirements. Contact us for additional information.They serve as an extension from the thermocouple to the measuring device. Thermocouple Extension cables must be of the same material as the thermocouples and compensating cables of material having the same thermo-electric characteristic as the thermocouple within the given temperature range.