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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.
- 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 ℃.
- 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