BenchTech BT-V40D Waterproof Monitor 12 Volt Battery Meter 3.0-30V DC Auto Gauge Small Digital Voltmeter Blue Red LED (BLUE 3.0-30V) Waterproof,Display Color: Blue/Red Measure range: DC 3.0-30.0V(Blue);DC 2.5-30.0V(Red) Display: three 0.40" LED digital tube; Dimensions: 40 x 25 x 23mm Permissible Error: 1% (+ / - 1 digit) BenchTech Authorised in Amazon: WesleyStore