The minimum working voltage Die Voltage of this device is 4 volts. If you decrease the voltage, the display will dim from about 6 volts, and then the device will continue to correctly measure the voltage up to 4 volts, after which it will actually turn off. Knowing the minimum voltage is helpful when using it with a boat motor battery, which when discharged will have a very low voltage when the trolling motor is running. Accuracy seems pretty good. I've compared it to my Fluke 77 ranging from 4 volts to 20 and it's about good to 0.1 volts.
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