Comprehensive Monitoring: This versatile 10-in-1 USB Tester is essential for analyzing the charging performance and efficiency of various devices. It accurately measures voltage, current, and power parameters, ensuring your gadgets operate at optimal conditions. Multi-Functional Device: Equipped to detect voltage (Voltmeter), current (Amperimeter), and as an Amp Volt Ammeter and a Power Bank Charger Indicator. It's an solution for tech enthusiasts and professionals. Portable and User-Friendly: Its compact design makes it easy to carry, ideal for on-the-go use. The clear digital display ensures easy reading of measurements, enhancing user convenience. Wide Application: Perfect for testing USB ports, chargers, power , and other electronic devices. A must-have tool for maintaining the health of your electronic devices. Color: Black Material: plastic Package Contents: 1 * USB Tester DC Digital Voltmeter Only the above package content, other products are not included. Note: Light reflection 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.