RioRand Waterproof Car Battery Condition Gauge (Auto/motorcycle Volt Meter Green LED, 2 Wire Dc 2.7-30v)

Dimensions: 40 x 25 x 23mm Cutting Size: 37x20mm,Measure range: DC 2.7-30.0V,Minimum input: DC 2.7V,Maximum input: DC 30V,Permissible Error: 1% (+ / - 1 digit),Display: three 0.40" LED digital tube, Display Color: green. Refresh rate: about 500mS,Current consumption: about 5-20mA,Operating temperature: -10℃ ~ 65℃,Voltmeter with epoxy potting, Full waterproof design, Oil Pollution Prevention, Moisture proof, Shockproof, Dust-proof With Reverse polarity protection. Please Note: Do not need power supply, can measure 2.5-30V directly. If the input voltage is below 3.5V, the display brightness dims, If the input voltage is below 2.5V,measuring inaccurate or no display, If measure 10V below, accurate to 0.01V,display x.xx,If measure 10V or more, accurate to 0.1V,display x.xx,If.