This is 0.28-inch Digital Display Voltmeter Ammeter DC 100V 100A LED Amp Volt Meter With Shunt. This Amp Voltmeter will measure up to 100 VDC with a 0.1-volt resolution. Moreover 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 display 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.In addition  this 3 wire harness is used for a ground that connects directly to the battery or supply ground of the load.

Note: The meter with a range100A must be connected to the shunt to measure the current no matter whether the measured current is less than 10A! Otherwise, it will burn the header.

Features And Specifications Of  Digital Display Voltmeter Ammeter:

• Power Supply (Measure Voltage): DC 4.5-30V
• Measure Voltage Range:0-100v
• Measure voltage < 10V,Min Resolution: 0.01V
• Measure voltage >10V, Min resolution: 0.1V
• Measure Current: 100A forward current ( more than 10A need shunt)
• Current Resolution: 0.01A
• Operating Current: <20mA
• Display: 0.28 "LED monochrome（red and red)
• Dimensions: 48 x 29 x 21 mm
• Cutting Size: 45 x 26 mm
• Measurement rate: ≥ 500mS / times
• Accuracy: 1% (± 1 digit )
• Operating Temperature: -10°c ~ +65°c
• Operating Humidity: 10 ~ 80% (non-condensing)
• Working pressure: 80 ~ 106kPa

Wire Connection:

• COM: Black wire, measure common ground
• PW+: Red wire, Power Supply +, Measure Voltage +
• IN+, Yellow wire, Measure current input. if use the voltmeter function only, please also connect the Yellow wire and black wire together to avoid the Interference

Package includes:

• 1 x DC 100V 100A Voltmeter & Ammeter
• 1 x 100A Current Shunt