DROK White LED 0.36" 3.0~30V Small Voltmeter Digital 18650 Cell-phone Lithium Battery Tester 5/12V DC Voltage Meter
Features:Cutting size: 23mm x 14mmThickness: 10mmMounting Hole Center Distance: 28mmMeasure Voltage:  DC 3.0~30V (No Need power supply, measure Directly)Input Polarity: DC VoltageMeasurement Accuracy: 1% (+ / - 2 digit)Display: Three 0.36" digital LED TubeDisplay Color: WhiteRefresh Rate: about 500mS / timesOperating Temperature: -10c ~ 65cReverse protection: havewhen measure 10V below:  the voltmeter display x.xxwhen measure more than 10V, the voltmeter display xx.xWiring:Red: Power Supply +,Measure Voltage +,(3.0 ~ 30V DC)Black: Power Supply -, Measure Voltage -Some applications:Measure 18650 batteriesMeasure Cell-phone Lithium BatteriesMeasure Nickel-hydride Battery PackMeasure Cars Motorcycles Battery Voltage,Etc.Package Includes:1x Digital Panel Voltmeter