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It has been said that a K type thermocouple is just 2 wires of different types twisted together (basically). If this is so then can such a thermocouple be made with a copper and steel wire twisted together? What about copper and nichrome?

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A thermocouple is made from two different conductors in contact - frequently welded, but twisting together will work too.

A type K thermocouple is made with chromel and alumel conductors. There are many types of thermocouple, designated by different letters, and using different metals. See the Wikipedia article on thermocouples, or do a web search for "thermocouple types" for more information.

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