[Detection voltage] DC 3.0V~30V; Maximum working voltage: 30V; Working current: Less than 30 mA; Detection rate: greater than equal 200 mS/time; Accuracy: 3% (+/- 1 word); Working temperature: - 10~+65Celsius; Working humidity: 10~80%; Working pressure: 80~106kpa[High precision]The digital voltmeter has reverse connection protection; the decimal point is automatically shifted[Excellent Quality]Mini Digital Voltmeter DC 3.0v - 30v 0.28 Inch 2 Wire Voltage Tester with New Features: Waterproof, Dustproof and DropproofColour:blueMaterial:plasticSize:4.57x3.31x1.06inchesPackage Contents:4 x Mini Voltage TesterOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.