Ammeter digital made from high quality ABS, small size with 89.644.624.4 mm, about 68g, only your palm size and suitable for all kind of place. Please note that this product don't include the external shunt. Voltage not only can show the voltage, current, energy and power, blue LCD backlight can help you read the value easily, have obtained CCC, FCC, CE certificate. Voltage test range DC 6.5-100V, current 0-100A, power: 0-10kW, energy 0-9999kWh, suitable for most of place, adding alarm threshold, please DO NOT exceed the rated parameters. Voltage alarm function; Energy reset function; Data storage when power off. Choose measuring range: Long press the key until the power area display "Curr", then release the key. At this moment, the current area displays "100A", short press the key toswitch between "100A" and "50A". This module is suitable for indoor, not outdoor. Applied load can not exceed the rated voltage and current. Our multimeter meter suitable for DC low-voltage place, Please follow the instructions or picture wiring, please do not connect the wrong wiring,please check whether the circuit is connected correctly before power-on. Size Name:100A