SMAKN Waterproof Monitor Three Wires DC 0-300v 12/24v/36v/72v/96v Volt Battery Meter Voltage Tester Automative Electric Cars Gauge Small Digital Voltmeter GREEN 0.52" LED Display

This item includes three wires.red/blue/green
Wire Red:Power Supply positive pole,Maximun 30V DC;
Wire blue:Measure positive pole.
Wire green:Common ground
Features:
Dimensions: 54x30x27mm
Cutting Size: 47.2x27.3mm
Measure range: DC 0-30V
Permissible Error: 1% (+ / - 1 digit)
Display: three 0.52 LED digital tube
Display Color: GREEN
Refresh rate: about 200mS
Current consumption: about 5-20mA
Operating temperature: -10 °c ~ 65 °c
Voltmeter with epoxy potting, Full waterproof design, Oil Pollution Prevention, Moistureproof, Shockproof, Dust-proof With Reverse polarity protection
If measure 10V below, accurate to 0.01V,display x.xx
If measure 10V or more,accurate to 1V,display xx.x
Package Include:
1x Digital Voltmeter