...If you have a sensitive volt meter (millivolts) you can use a TC table to get an idea of whether or not the TC is OK, for example if the temp in the oven is 50C (122F) the mV will be 2.03 but you have to add the cold junction mV which (in a 25C (77F) ) room temp will be 1.000 mV, so you would read 3.03 mV.Here's a link to a type K TC table.thermocoupleinfo.com/pdf/type-k-thermocouple-reference-table.pdf
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