This USB voltage multimeter is lightweight, small in size, durable and portable. It is designed to measure voltage USB power supply equipment, empty load, the voltage and of USB terminal equipment at work. It is easy to carry and no extra cable or power supply is needed. Compact and also detect USB charger output voltage and are standard suitable for factories, laboratory and users. Features - Portable, light weight, small size and durable. - Easy to measure the USB charging , voltage, discharge capacity - High temperature can be used for measuring USB powered or power consumption of the interface , mobile phone charger , U disk and other products. - Regular . When it’s showing 00:00H , press and hold the button for about 3 seconds and there will be flashing numbers on the display. Press the button for 0.5 second and each time you press the button, it will add 0. . Then press and hold the button for about 3 seconds to save. - With precision calibration function for higher accuracy Specifications - Color: Black - Material: Plastic - Size: 7.3x2.8x1.5cm - Accuracy: ±1% - Connectors Supported: USB - Voltage: DC 3-9V (0.01V resolution) - : 0-5A (0.01A resolution) Package list: 1 x USB meter