New Waterproof Battery Meter Auto Car Gauge Digital Voltmeter Led Red/green/blue Material: Plastic Display color: Blue Specification: Dimensions: 40 x 25 x 23mm Cutting Size: 37x20mm Measure range: Blue (DC 3.0-40.0V) Maximum input: DC 40V Permissible Error: 1% (+ / - 1 digit) Display: Three 0.40" LED digital tube Display Color: Blue (DC 3.0-40.0V) Refresh rate: about 500mS 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 Application: Do not need power supply, can measure 2.5-40V 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 When measure 10V below, accurate to 0.01V,display x.xx When measure 10V or more,accurate to 0.1V,display xx.x Size: Quantity: 1 PC Note: Manual measuring, please allow 0-1cm error,thank you. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.