Femitu Waterproof Voltmeter Monitor DC 4.5-150V 12/24/36/48v Volt Battery Meter Voltage Tester Automative Electric Cars Gauge Small Digital Voltmeter 0.56"led Red Measure range: DC4.5-150V (Do not need Power Supply, Measure 4.5-150Vdirectly ) Display: three 0.56 "LED digital tube Display Color:red Refresh rate: about 500mS Voltmeter with epoxy potting, Waterproof, Oil Pollution Prevention, Moistureproof, Shockproof, Dust-proof With Reverse polarity protection