Features: Monitor charging efficiency in real time with this double port USB electricity current tester, featuring a bright LED display for 0-5A current and 3-9V electricity readings across two simultaneous devices. Engineered with protective and ABS housing, this portable USB current electricity detector deliver diagnostics for adapters, and mobile accessories through plug and play operation. Ideal for engineers, enthusiasts, and users requiring accurate charging diagnostics for smartphones, tablets, or USB power gadgets during repairs or optimization. Perfectly sized for workshop, or home offices to charging outputs, troubleshoot battery drain without complex setups. Maintenance with current/electricity visualization – the USB diagnostic tool for optimizing charging speeds and ensuring electrical safety across multiple gadgets. Specifications: Component:ABS Type:1Pc/3Pcs Size: Approx.74mm/2.91inch Input/output electricity 3V-9V electricity resolution: 0.01V Input/output current: 0A-5A (recommended 0-3A) Current resolution: 0.01A Accuracy:±1% Line loss: about 0.1ohm Package Includes: 1Pc USB Meter Tester note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.