Thermocouple extension wire is a flexible, insulated wire used to extend a thermocouple signal from a probe back to the instrument reading the signal. It works accurately over a narrower temperature range than thermocouple wire and can't be used in the sensing point (or probe part) of the thermocouple. It is typically used as an extension to a measuring instrument over long distances.
Thermocouple wire is a flexible, insulated wire used to link a thermocouple to a temperature control device. It may also be used to make the sensing point (or probe) of the thermocouple. The wire determines the component's temperature and relays the information to the device. It works accurately over a wider temperature range than thermocouple extension wire. There are four types of thermocouple wire, and each one has a positive and negative lead.
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