X-DRAGON USB 2.0 Digital Multimeter Power Meter Tester Current and Voltage Monitor, Test Speed of Chargers, Cables, Capacity of Power Banks (7 Modes Monitor, dual USB ports, Accuracy) PROMOTION for 3 Days, 7 Modes Monitor: The USB monitor can display voltage, current, capacitance and power, press the button to switch among seven different display modes Measuring Range: Voltage 3.2-15V Current 0-3A Accuracy: +/- 1% Dual ouput: Output one is used for both charging and data transfer, Output two is for large current fast charging Display: Simultaneously displaying of Amp and Volt in real-time Widely used: Perfect for testing how fast a USB cable or USB power charger, such as power bank, solar charger