Features: Easy install Power supply:DC 3.5v-30V Measuring Range: DC 3.5v-30V Measuring Current: 100A Display: 0.28"LED digital tube Large high-visibility. Low power consumption.. Operating Current: <20mA Resolution degree 1%+1 digit Operating temperature -10~65 degree Operating Pressure: 80 ~ 106kPa Specifications: LED Color: red +blue Size:about47*28*17mm Net weight:20g Package weight:30g Packing Content: 1 x Dual LED Digital Voltmeter Ammeter