a LED voltmeter draws such a very small amount of power (current) I think I'd wire it in and leave it powered up all the time... I'm guessing that the power requirement is lower than than base power needed to run the circuit board on the refrigerator or furnace...
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Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
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