SMKAN&reg; 0.40" Waterproof Digital Voltmeter DC 2.5-30V BLUE LED Auto Mini 12V Volt Tester Panel Meter Dimensions: 50 x 30 x 27mm Measure range: DC 2.5-30.0V Display: three 0.40" LED digital tube Display Color: BLUE Permissible Error: 1% (+ / - 1 digit)