Thermocouple extension wire has approximately the same characteristics as thermocouple wire, but its accuracy is guaranteed over a more limited range of temperatures. Thermocouple extension wire can offer advantages in cost or mechanical properties when used for connections between thermocouple and instruments. For base metal types of thermocouples, extension wire is of substantially the same composition as the corresponding thermocouple type. For precious metal types, however, an entirely different alloy is formulated to match the noble metal characteristics over a specified temperature range. This is necessary due to the high cost of the precious metals, which would otherwise be necessary for the interconnection. The X in the IEC and ANSI code denotes extension grade wire. Thermo-Electra offers several kinds of insulations and shielding types to deal with the requested application. The production is not only flexible for manufacturing standard type of cables, but also for manufacturing to customer demands.