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41596Re: Furnace temperature

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  • ferrman1001
    Jan 3, 2012

      Yes, you were right it is a 'R' type thermocouple probe and when I purchased it 18 years ago it was insanely expensive and I don't think anything has changed at the present time. It has been really helpful in fine tuning my furnace so I can get hot cast iron. I think the second hand market would be your best bet.

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