USB Charger Tester — Compact, Portable, No External Power Key benefits Diagnose chargers quickly: Instantly verify the output voltage and current of USB chargers to confirm they work as specified and avoid underperforming or faulty adapters. Protect devices and maintain efficiency: Regular checks help ensure connected devices receive proper power, supporting battery health and reliable charging. Truly portable and easy to use: Small footprint and simple controls make testing anywhere fast and convenient. Main features Compact size: Measures 2 x 28 x 15 mm, easy to carry in a toolbox, drawer, or pocket. No external power required: Operates without a separate power source, so you can test chargers on the go. Reliable output measurements: Displays output voltage and current so you can validate charger performance and troubleshoot issues. User-friendly operation: Toggle between voltage and current readings easily; designed for straightforward use by technicians and beginners alike. Broad compatibility: Works with a wide range of USB-powered devices and standard USB chargers. Practical use scenarios Quality control in manufacturing or repair shops: Quickly check multiple chargers to confirm they meet specifications before shipping or returning devices to customers. Laboratory and R&D testing: Use the tester for fast, on-the-spot verification of USB power supplies and prototypes during development. Travel and field use: Carry the compact tester to confirm unknown chargers or USB power banks provide safe and stable output while away from your usual tools. What it solves Eliminates guesswork about charger health and compatibility Helps identify underperforming or unsafe power supplies before they damage devices Provides an easy, portable way to perform routine checks without bulky equipment Who should use it Electronics technicians and repair professionals Quality control and lab personnel Hobbyists, travelers, and anyone who relies on USB chargers for phones, tablets, power banks, and other devices Technical note Size: 2 x 28 x 15 mm Function: Measures and displays USB output voltage and current; no additional power source required Simple, reliable, and portable — a practical tool for testing USB chargers in workshops, labs, and on the go.