Features LED Display: LED display design gives you quick reading, can make you distinguish voltage and current easily. Measuring Range: 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. Long Service Life: The digital voltmeter ammeter is made of high quality materials with dustproof processing, reliable and durable for long time use. 2 in 1: 2 in 1 design, voltmeter and ammeter, make you get the data at the same time. Easy Installation: Easy to install and use, suitable for various uses, is easy to be install, don't need to use much time on installation. Specification: Material: Plastic Working voltage of Meter itself: DC 4-30V Note: The maximum input voltage can not exceed 30V. Otherwise the meter will be burned. Working current of Meter itself: ≤20mA Voltage Measuring range: DC 0-100V Current Measuring range: DC 0-50A, DC0-10A Low operating voltage: + 4.5v High working voltage: +30V Voltage resolution (V): 0.1V Current resolution (A): 0.01A Measure accuracy: 1% (±1 digit) Display: 0.28" digital tube, Two color Blue and Red Refresh rate: about 300mS/ times Working temperature: - 10 ℃ ~ + 65 ℃ Working humidity: 10-80% (no condensation) Size: approx. 48 x 29 x 26mm Operation Temperature: -10℃~+65℃ Size: approx. 48*29*21mm / 1.89*1.14*0.83in Weight: approx. 26g Options(Color of Digit & Amp): Red & Red-10A, Red & Blue-10A, Red & Red-50A, Red & Blue-50A Package list: 1 * Digital Voltmeter Ammeter 2 * Wire OR 1 * Digital Voltmeter Ammeter 2 * Wire Package List