DROK LED Dual Display Voltmeter Ammeter DC 0-100V 100A Voltage Current Meter Digital Volt Amp Monitor Gauge Panel with Shunt

Parameters:  Power supply: DC 3.8-30V  Power consumption:  Refresh rate: about 3 times/s  Voltage range: 100V  Voltage internal resistance: 400K  Current range: 100a  Current internal resistance: 75mV  Shunt Test accuracy: 0.2 percent + 2 words  Current resolution: when within 100a, 00.00-99.00; when 100a, 100.0.  Overload capacity: 120a, one minute (when within the overload capacity, the display still can show but please don't over the specified time. We suggest the average current be about half of the range)  Display color: red voltage + Blue current  Hole size: 45.5mm * 26mm  Dimensions: 48mm * 29mm * 20mm with reverse polarity protection, but the input still can't over 30V when connecting reversely.  The meter can measure positive voltage and positive/negative current, the Decimal point will Flash when measuring negative current, and it will automatically move when less than 1a, unit is MA. current sampling uses an independent AD conversion chip, more stable and accurate. Very suitable for monitoring battery.  note: the meter must be powered by an isolated and not common ground power supply, or it will cause large errors when measuring current, and the best is DC 5V.  You can also make an isolated power supply by an isolated module. the meter should be connected to the negative to measure current, or it will be burnt.  package includes:  1 x Volt and amp meter  1 x 100a/75mV shunt