MICTUNING J0001L DC 12V LED Display Voltmeter Waterproof for Boat Marine Vehicle Motorcycle Truck ATV UTV Car Camper Caravan Red Digital Round Panel
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It will, I read as low as 3 on mine. A 5VDC battery
There are no wires in the package
The electrical systems in aircraft usually operate at 12 volts, but some operate at 28 volts. Voltmeters with a max voltage limit of 24 volts are available. Thus, if your aircraft is 28v, I believe that it would be unable to work properly, if it works I am pretty certain that it won't meet the rules for IFR flight because nearly every piece of equipment used for IFR flight must be certified by the FAA.
I have a 12 volt system and this voltmeter works only for that. A voltage meter is capable of measuring the following A 12-point scale A 24V battery.