Features:2 in 1 design, voltmeter and ammeter, make you get the data at the same time.LED display design gives you quick reading, can make you distinguish voltage and current easily.This product is made of high quality materials with dustproof processing, reliable and durable for long time use.Measuring range is DC 0-100V, with reverse polarity protection and common ground design, don't need to worry the damage caused by reverse polarity.Easy to install and use, suitable for various uses.Specification:Material: PlasticWorking voltage of Meter itself: DC 4-30VNote: The maximum input voltage can not exceed 30V. Otherwise the meter will be burned.Working current of Meter itself: 20mAVoltage Measuring range: DC 0-100VCurrent Measuring range: DC 0-50A, DC0-10ALow operating voltage: + 4.5vHigh working voltage: +30VVoltage resolution (V): 0.1VCurrent resolution (A): 0.01AMeasure accuracy: 1% (1 digit)Display: 0.28" digital tube, Two color Blue and RedRefresh rate: about 300mS/ timesWorking temperature: - 10 ~ + 65 Working humidity: 10-80% (no condensation)Size: approx. 48 x 29 x 26mmOperation Temperature: -10~+65Size: approx. 48*29*21mm / 1.89*1.14*0.83inWeight: approx. 26g Options(Color of Digit & Amp): Red & Red-10A, Red & Blue-10A, Red & Red-50A, Red & Blue-50APackage list:1 * Digital Voltmeter Ammeter2 * Wire.