301342 Easily measure the output voltage of the USB port and the working current of the device Resolution: voltage 10mV， current 1mA Compact volume， do not need power and other ancillary equipment， plug and play Can detect whether the output voltage and current of the USB charger reaches the standard or not Color: blue Material: ABS Size: about 54 x 34 x 5mm Port: USB port Digital display: voltage / current Technical indicators: Working range: voltage: DC3-7.5V current: 0 ~ 3A Error: voltage ± 1% current ± 2% Working temperature: 0-60 Celsius degree Function: mobile phone charger voltage detection and so on 1 x USB current / voltage tester