Compact and easy to carry, no additional power supply, plug and play. It can easily measure the output voltage of the USB port and the device operating current or load voltage Detect any USB charger such as PC USB, home charger, car charger. Wide range of applications, any phone, any electronic product, Easy to use. Suitable for factories, laboratories and personal use. Voltage range: 3.3V-18V Current range: 0-3A Voltage display: red Current display: blue Size: 52mm x 34mm x12mm Weight: 16g