Discover the versatility and precision of the KWS V21 USB Voltmeter Ammeter Load Tester, a must-have tool for anyone working with digital devices and power supplies. This compact and efficient multimeter is designed to provide accurate measurements and reliable performance, making it ideal for laboratories, factories, and personal use. Multi-Purpose Functionality: The KWS V21 USB Tester is perfect for testing the actual charging voltage and current of cell phones and various digital products. It also measures charging capacity and time, all displayed clearly on its integrated screen. This makes it an essential tool for monitoring and optimizing the performance of your devices. High Accuracy: Equipped with an accurate band crevice reference, this USB current meter tester offers a precise range and high accuracy. Its stable and reliable performance, coupled with strong anti-interference ability, ensures you get consistent and dependable readings every time. Comprehensive Measuring Range: The USB battery checker covers a wide measuring range, with a current range of 4‑30V and a voltage range of 0‑3A. It also tracks timing from 0 to 99 hours and 99 minutes, and charging capacity from 0 to 99999mAh, providing comprehensive data for thorough analysis. Wide Applications: This USB power meter is versatile enough to measure the working voltage and current of no-load power supply devices, voltage loads, and USB terminal devices. It is widely used in factories, laboratories, and by individual users who need precise power measurements. Compact and Portable Design: Designed for convenience, the KWS V21 is compact and easy to carry, requiring no additional power supply or ancillary equipment. Its plug-and-play functionality makes it incredibly user-friendly, allowing you to start testing immediately without any hassle. Enhance your testing capabilities with the KWS V21 USB Voltmeter Ammeter Load Tester, combining precision, versatility, and ease of use in a compact package. Whether you're in a professional setting or working on personal projects, this tool is your reliable partner for accurate power measurement.