Description: brand new and high quality Features: The negative of power supply and the testing side are connected.It need a independent power supply. It can'for t be allowed more than two meters use one power supply. The wide power supply range, with reverse polarity for protection. Display voltage and current on the screen at the same for time. Use the SMT technology,so consistency is very good. With a back cover, safe, reliable and dustproof. The decimal point automatically shifted. Good anti-interference ability, showing the refresh speed. With a voltage calibration potentiometer, current calibration potentiometer, you can calibrate by yourself. The tolarance is absolutely exist. With five wires,connection is convenient,used to monitor the battery voltage,can be also used for other products. Specifications: Item Name: Digital Voltmeter Ammeter Material: ABS Features: Digital Voltmeter Ammeter, Digital Display Voltmeter, Panel Amp Device, Voltage Current Meter, Voltage Measurement Tool Size: app.7x4x3cm/2.76x1.57x1.18in Color: Black, White (optional) Quantity: 1 Pc Note: No retail package Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package Includes: 1 x Digital Voltmeter Ammeter