Welcome to our store! USB Tester Voltage Current Tester The USB controller can detect voltage, current, and power of USB. Perfect phone charger tester for charging speed and quality. Measure Voltage: 3.0V-9V; Measure Current: 0-3A. Upgraded Color Display Screen The power number is displayed in red and the voltage number is displayed in blue, with large characters that are clear and easy to read. High Quality USB Amp Reader The USB amp reader uses a new generation of power four semi-dual loop integrated converter IC, with a precision bandgap reference, range accuracy, high precision, stable and reliable performance, and strong anti-interference capability. Wide Range of Applications The USB voltage controller can measure USB-powered devices or interface power consumption, mobile phone chargers, U-disks, and other products. Easily measure the operating current of the output voltage of the USB port and equipment. Small and Portable Our USB tester is small and requires no external power; simply plug it in to detect the output voltage and current of your USB charger. Satisfaction: Our customers are our top priority. If you find any issues with the product after receiving it, such as damage or incorrect quantity of goods, please contact the seller immediately. We will do our best to provide you with satisfactory customer service.