Review on High-Quality 4-Piece Waterproof Car Voltmeter with LED Digital Display Panel and Mounting ⚡ Plate - Ideal for Boat, Vehicle, Motorcycle, Truck, ATV, UTV (Red, DC 12V 24V) by Keith Wachtel
Not very accurate on spare parts
I wanted to track battery levels in my cars. Unfortunately, the accuracy of these voltmeters is not 0.1 volts. I have a Fluke DVM that periodically goes out to calibrate and test all of these 4 voltmeters. I only found 1 that was between 11.5 and 14.5 volts DC at 0.15 volts. The rest was low between 0.2 and 0.3 volts. They all had a nice QC sticker, but they weren't accurate enough to judge the state of charge of my batteries. Save money.
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