Review on 📊 bayite Pack of 5 Three-Wire Calibratable DC Mini Voltmeter: Monitor Car/Motorcycle Battery Voltage with 0-30V Range, Mountable Tester Gauge, 0.36" Blue LED Panel Display by Chad Mills

They all appear to be accurate and only one of them had to be set to 0.1v based on my fluke gauge. Bright display, easy to read. Like three wires configured to read the voltage of the same or a separate device. I do not like it. Since there is no frame you will need a CNC machine to cut the exact hole to install them and still look good. See image. The wires come out from the top of the board. See other picture. So if you mount it through the panel. You'll need a couple of washers to position it so it lays flat. If the wires were soldered to the other side of the board it wouldn't be a problem.