[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. Meanwhile multimeter USB detector can be applied to the Power Capacity Storage and Over/Low Voltage-current Protection. It allows you to find the charging problem of the USB cables, wall chargers, and car charges more easily. [BUILT-IN MORE SAFETY]: Each USB meter tester has been built-in circuit with containing CW3002D chip for accelerating Large Current Fast Charging. Plus the Interior Smart System is designed to detect safety. The multimeter tester also supports QC 2.0/3.0 high voltage test, with the function of cutting off automatically when it's fully charged, to protect your valuable devices effectively. [PREMIUM LCD DISPLAY]: Crafted from high-grade LCD monitor with low power consumption feature, bright and clear enough to monitor the parameters on the screen. Comes with three various display modes for your choosing. Ideally be broadly applicable to test capacity and electric energy of power bank; test the maximum output current of the charger; and test charging speed and quality of data cable and charging cable. [WIDE TESTING RANGE & SIMPLE OPERATION]?Input/Output Voltage: DC3-30V, Current Range: 0-5.1A. This portable USB tester is easy to carry and enables you to put it in your bag or your pocket whenever you go, along with the symmetrical and reversible connector for your simply operation. [PACKAGE]: 1X Multimeter USB Tester. 100% SATISFACTION WARRANTY: We stand behind all of our products 100%.Every item includes one year hassle-free guarantee with considerate customer service. YOMOSI always bear in mind that your satisfaction is our priority. For any reason you are unsatisfied with our product at any time, just feel free contact support for exchange or refund. Our customer service team are here and ready to assist you with any questions.