0.28 Inch Mini DC 0-100V 3 Wires LED Digital Display Voltmeter Voltage Meter Detector Monitor Tools . Description:DC range 0-100V, 2 wire and 3 wire products are common, breaking the conventional voltmeter, is the latest design, can work directly in 5V, 9V, 12V, 24V and other circuits, no need to adjust the voltage. Equipped with three wires, it is easy to connect to the car/jumper cables/motorcycle line, with reverse connection protection function, the wire connection will not burn. It is used to monitor battery voltage, keep up to date with battery voltage status, and can also be used to measure the voltage of other products. Note: the three-wire voltage range is 0-100V, which can also be used for two-wire, but the voltage should be 40V. Features:1. Good product stability and high measurement accuracy2. The appearance is standard and easy to install3. The power supply uses a polarity protection circuitSpecifications:2-wire working voltage: 4.0 - 40V (with reverse connection protection)2-wire detection voltage: 0.0 - 40V3-wire working voltage: 4.0 - 40V (with reverse connection protection)3-wire detection voltage: 0.0 - 100V Working source: lt; 20mA Display Rate: 0.28" LED, Red Blue Green Yellow (Color Optional)Mounting Hole: 23 × 10mm Measurement Speed: ge; 200mS/TimeMeasurement Accuracy: 3% Minimum Operating Voltage: +4.0V Maximum Operating Voltage: +40V Operating Temperature: -10 - +65° Coperable Voltage: 10 - 80% (non-condensing)Working Pressure: 80 - 106kPaSunlight: no direct illuminationNote: please allow 1-3cm error due to manual measurement. Make sure you don't 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 Included:1 × Digital Voltmeter