DC 0V To 99.9V LED Digital Voltmeter Red

Wide measurement range 0-99.9V.
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.
Power supply:DC 4.5v - 28V. Working temperature: -10℃ - 65 ℃.
How to use it :

Red line:Power Supply + (4-30V )
Yellow line:Measure Voltage +
Black line:Power Supply -, Measure Voltage-
Red: positive power supply, you need access to power within the positive range DC 4.5-30V
Black line: Public negative, both powered anode is measured with reference to the negative
Yellow Line: Measuring signal input positive

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