Can easily measure the operating current of the output voltage of the USB port and equipment Small size, no power, and other ancillary equipment, plug and play also detect USB charger output voltage and current are standard suitable for factories, Laboratory and users. Uses a new generation of power four semi~ double loop integral converter IC, with a precision bandgap reference, range accuracy, high precision, stable and reliable performance, strong anti~interference ability , high temperature can be used for measuring USB powered or power consumption of the interface, mobile phone charger, U disk and other products. Scope of work: Current (0~2.5A) can detect mobile phone charger voltage compliance DC5V Specification: Operating Range : U = 3 ~ 9V I = 0 ~ 3A Resolution : Voltage 10mV current 1mA Error : voltage