Description The voltmeter need independent power supply, power supply range is DC 4.5-30V, powered access between the red and black lines, Firstly the voltmeter shows 0.0, then you can put the red and black line in between to measure voltage. Features: 0.56” Segment LED display header Wide measurement range 4.5v – 30V. Power supply:DC 4.5v – 30V. Mini Red LED display. Low power consumption. Refresh speed: 500ms. Snap on design for easy installation. led colors:Red. Refresh speed: about 500ms/each time. Working temperature: -10℃ – 65 ℃. Wiring: Red line: power supply for voltmeter, you need access to positive power supply in the range of 4.5-30V DC Black line: the common negative, the power supply negative electrode, but also measurement of the reference negative Yellow Line: measuring the signal input positive Documentation: You can see the product reviews here.
