Frienda 4 Pieces DC 12V Car Voltage Gauge LED Display Waterproof Voltmeter Digital Round Panel Voltmeter Compatible with Vehicle Motorcycle Truck Camper Caravan ATV UTV Car Boat (Blue)

These are nice and bright but depending on your needs only reading in tenths may not be enough, to accurately read battery voltage you need 2 digits right of decimal instead of 1 digit, battery voltage has very narrow operating range, if you use these with inverter batterys then 2 digits are needed to know where 50% capacity is to avoid deep discharging batterys.

Compact size , nice led display easy to install works as should, perfect for displaying constant voltage in my race car.

Works as expected. Accurate when compared to professional meter. When received, one gauge didn't work. Tossed it and still felt good about having 3 working, accurate gauges for the money.

Two of these worked and then quit. In my application, a spontaneous 13.5VDC possibly with a spike was killing them. I wired a 50VDC, 10uF capacitor across the terminals( being aware of the polarity) to dampen any spikes and it's been fine ever since. The capacitor did add a bit of delay time in the meter response but for me, it was better than burning them out.

I installed several in my sailboat. Voltage measurement mirrors my other voltage readers, as far as the accuracy. Installation was easy as well once you fish the cables.

Doesn’t work very good on my garden tractor. Two of them quit working in a period of 1week

Perfect fit into pre-existing 12v outlet/cigarettes lighter

Not accurate at all, the higher the charge, the lower the accuracy. But once you figure that out you can kind of guess where the voltage sits at. I'm using it in my van to monitor voltage for off grid mostly. But hey, can't complain about it to much, it's dirt cheap lol (display says 12.1 yet my tester says 12.65)

These worked as advertised, a little tough to see the BLUE numbers in the sunlight though without putting my hand over them to shade it.. Works fine for what is required.

For what it was intended, says my husband

Works good

I have alot of these red blue and green and they all work great and some are out in the elements and they just work good