J Type Thermocouple
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The type J is also very common. It has a smaller temperature range and a shorter lifespan at higher temperatures than the Type K. It is equivalent to the Type K in terms of expense and reliability. Temperature ranges · Thermocouple grade wire, –454 to 2,300F (–270 to 1260C) · Extension wire, 32 to 392F (0 to 200C)