Features 1.MULTI PURPOSE: USB battery checker to test the actual charging and voltage and current of cell phones and various digital products, and charging capacity, charging time, a screen with display. 2.HIGH ACCURATE: USB current meter tester has accurate band crevice reference, accurate range, high accurate, stable and reliable performance, strong anti interference ability. 3.MEASURING RANGE: USB battery checker measures current range 4?30V, voltage 0?3A, timing 0 to 99 hours 99 minutes, charging capacity 0 to 99999mAh. 4.APPLICATIONS: USB power meter can be used to measure the working voltage and current of no load power supply devices, voltage loads, USB terminal devices. Used in factories, laboratories and users. 5.COMPACT STRUCTURE: USB power meter is compact and easy to carry, no need for additional power supply and other ancillary equipment, plug and play. specificationItem Type: USB Voltmeter Ammeter Load Tester Shell Material: PC Shell Color: Bright Gray Interface: USB2.0 Voltage: 4 to 30V Current: 0 to 3A Timing: 0 to 99 Hours 99 Minutes Capacity: 0 to 99999mAh Power Down Save: Save Data Every Minute Product Features: Test the Actual Charging and Voltage and Current of Cell Phones and Various Digital Products, And Charging Capacity, Charging Time, A Screen with the Same Display PackageList1 x USBVoltmeterAmmeterLoadTester