Small in size and light in weight,quite easy and convenient to carry out.0.28 inch visible LED display, easy to read even in lightIt requires extra supply of 4V to 40V;With reversed connection protection, meaning it will not burn even when wires are connected reverselyParameters:2-wire Working voltage: 4.0~40V (with reverse polarity protection)2-wire Measuring voltage: 0.0~40V.Measurement accuracy: 1 % (+/- 1 digit) refresh rate FF1A; about 200mS/timeOperating temperature: -10c ~ +65c consumption: 5-15mA under normal conditionsCutting Size: 23.5mm x 10mmMounting hole distance: 28mmRed: +, (4.0~40V DC)Yellow: measuring voltage +,(0~ 100V DC)Black: Measuring VoltageNote: 1. The meter requires an additional DC 4.0 to 40V supply2. The resolution is 0.1V, the actual error may be greater than 0.1Vsize:30x10x8 mmMaterial:ABScolour:Yellow+Black+RedPackage Contents:1 * voltage displayOnly the above package content, other products are not included.Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.