This is 0.28-inch Digital Voltmeter Ammeter DC 100V 50A LED Amp Volt Meter With Shunt. This meter will measure up to 100 VDC with a 0.1-volt resolution.
One thing to note is, this meter has 2 wiring harnesses. One harness is to provide power for the meters, that’s the 2 poles with a RED and a BLACK lead. Small size, portable, the magnitudes of voltage and current are displayed on the same screen at the same time.
This can be supplied anywhere from 6 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.
Operating Voltage: 5V DC
Current Consumption: <60mA
Testing Voltage: 0-100V
Testing Current: 1-50A
Easy to read even in dim light