Features 【FUNCTION】: A professionally manufactured voltage and ammeter, the meter is equipped with five wires, which is convenient for wiring, and is used to monitor the battery voltage and grasp the battery voltage status in time. 【USE】: The ground wire of the measuring end is interconnected with the ground wire of the power source (except for the isolation meter). The dual-display voltage and ammeter is easy to install and disassemble quickly, and can be used to measure the voltage and current of other equipment. 【ACCURACY】: The meter is equipped with a voltage calibration potentiometer and a current calibration potentiometer. If there is an error, it can be calibrated, because the error is absolute, precision manufacturing, and accurate data. 【FLEXIBLE】: Strong anti-interference ability, fast display refresh rate, real-time update of voltage measurement data, voltmeter adopts automatic decimal point moving design, clear display screen, easy to read. 【SAFETY】: The meter head adopts a wide power supply range: DC3.5~30V (except for the isolation meter), and the measurement voltage cannot exceed 30V. When the power is reversed, the meter will not burn out, but the screen will not display the value. Connection method: This meter is equipped with five lines, please find professionals strictly according to the following wiring diagram, if any questions, please feel free to contact customer service: Meter head power supply: two-wire socket Fine _ black line: meter head power supply Fine _ red line: power supply to watch head is positive (note, the voltage between fine red and black line cannot exceed 30V) Isolation meter (isolated power supply): The meter head power supply end and the test end are completely insulated and isolated from each other, can share one power source in multiple meters, "no need" is worried about all kinds of interference problems caused by sharing the power supply, suitable for the factory aging test stand, test stand, or other equipment requiring more than one meter head Power supply voltage: DC8-18V Test end: COM: Test Common End V +: Test positive voltage input A +: Test "positive" current input end;Because the meter head adopts the common ground design, that is, the ground wire at the measuring end is connected with the ground wire at the power supply end, so it can only be connected between the negative and the negative power supply of the equipment under test, as shown in the following figure, the connection error will burn, (if only do voltmeter use, it is recommended to connect the yellow line with the black line, Prevent the digital flicker of ammeter caused by external interference) Non-shunt _ connection method: suitable for "below 20A" without external connection. Package List