Description: It can measure empty USB-powered devices and. Easy to use and practical. Compact and easy to carry, no extra power required, plug and play. It can easily measure the output voltage of the USB port and the working current of the device or load voltageDetect any USB charger, such as USB for computer, home charger, car charger. Wide range of applications, any phone, any electronic product, easy to use. It is suitable for factories, laboratories and personal use. It can measure usb interface, mobile phone charger, u disk and other products or power situation. Voltage: 3.5V-7.0V 0.1V ErrorCurrent Current: 0A-3A 0.01A Error Size: 52mm x 33mm x 14mm (Approx.) Color: BlueNote: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!Package Included:USB Power Tester x 1