MULTIFUNCTIONAL USB TESTER: USB Meter Tester is mainly used to detect USB charging current, voltage, discharge capacity, quantity of electric charge, power, timing and so on. It supports QC2.0/QC3.0,BC1.2,Apple Iphone 2.4A and other protocol quick charging styles of cellphone and chargers. UILT-IN MORE SAFETY: Real-time monitoring of charge data, USB monitor will automatically cut off when the device is full charged, makes it controllable and more secure when charging, effectively protect your device. PREMIUM LCD DISPLAY: to monitor the parameters on the screen. Comes with three various display es for your choosing. It allows you to find the charging problem of the USB cables, wall chargers, and car charges more easily. WIDE TESTING RANGE & SIMPLE OPERATION:Input/Output Voltage: DC3-30V, Current Range: 0-5.1A. Symmetrical and reversible connector,plug and play,easy to carry Perfect for evaluating whether or not the computer, USB wall charger, USB car charger are outputting acceptable voltage and current range for the device you are connecting This Power Meter Tester can plugs directly into any USB socket or cable, which displays on the screen the voltage, current and capacity It provides you a rough estimate of the capacity of the device you are charging Specification: Input/Output voltage: 3V- 30V, Voltage Resolution: 0.01V Current test range: 0- 5.1A, precision 0.01A Cumulative capacity range: 0- 99999 mAh, precision 0.001Ah Cumulative power range: 0- 999999mWh, precision 0.001Wh Power calculation range: 0- 299.999W, precision 0.001W Timing maximum time: 0- 999hours 59min 59s, accuracy:1s Accuracy: +/-1% Line loss: 0.1Ohm Product size: 65mm * 24mm * 14mm Color: Black Material: ABS Operation Introduction 1.The short press is the interface switch, and long press is battery capacity and other data reset; 2.In the main interface, five-press is the setting of automatic power outages and timing turn-off(Five-press in the main interface, the character in the lower right corner of the display stars flashing, choose three settings of 'AO.. / OFF / 1-24H' by clicking or double-clicking, and when the flashing stops, it means the system saves the current settings automatically); 3. Six-press is Chinese/English interface conversion. Package Contents: 1 x Current Voltage Test Meter Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.