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    What Is A 250-750 mv Thermopile?

    I am looking at a thermopile (a cigarette shaped/sized item similar to a thermocouple) rated at "250-750 millivolts" output. Could someone explain the meaning of 250-750 mv versus 250 mv output by itself or 750 mv output by itself? The heater I want to install it in does not work with its old...
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