This is DSN-VC288 LED Digital Ammeter–Voltmeter. This meter will measure up to 100 VDC with a 0.1-volt resolution.

This can be supplied anywhere from 4 volts DC up to 30 VDC. This is a separate power supply that is isolated from the source, it is possible to use the same supply but it seems to affect the amp meter reading. The 3 wire harness is used for a ground that connects directly to the battery or supply ground of the load.

1. It measures up to 100V and 100A DC.
2. Very handy and small in size.
3. It requires a power supply of 4-30V Max.
4. 100% Brand new and high quality.