1PCS USB Voltage Detector Voltmeter Tester Mobile Power Tester Voltmeter Features: 1. This product can measure the voltage when the USB powered device is empty and loaded, and the voltage and current when the USB terminal device is working. 2. This product uses original imported microcontroller to sample and display the voltage, and a lot of data processing has been done in the software to make the display accurate and stable. 3. This product is a full chip process, the craft is superb, while the size is ultra-small. 4. This product current, voltage cycle display, easy to use and convenient practical. 5. This product is small and easy to carry, no need to connect another power supply. Specification: Measurement accuracy: 1% Refresh speed: approx. 200ms at a time Display mode: alternating current and voltage display Voltage measurement range: 3.5V - 7V Current measurement range: 0A-3A Operating current: 20mA Colour: blue transparent Storage temperature: -10°C to +65°C Meter voltage drop: 200mV Weight: 15.4g External dimensions: 52*20*15mm Package included: 1*USB current and voltage detector Note: 1. Please allow 1-3mm error due to manual measurement. Please make sure you don't mind before ordering. 2. Please allow 1-3g weight error. Please make sure you don't mind before ordering. 3. Due to different lighting in the photos and differences in monitors, the pictures may not reflect the actual colour of the object. Please make sure you don't mind before ordering, thank you!