USB Voltage Charge Doctor Current Tester for Mobile Phones Tablets(Blue) Technical indicators: 1) Scope of work: Current (0-2.5A) can detect mobile phone charger voltage compliance DC5V 2) scope of work: U = 3 ~ 7.5V I = 0 ~ 3A 3) Resolution: Voltage 10mV current 1mA 4) Error: voltage < 1% current < 2% 5) Full scale drop: When (measuring current 200mV) 6) Operating temperature: 0-60 The tester 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. 1) It can be used to measure an empty USB-powered devices, voltage loads, USB terminal equipment working voltage and current. 2) current and voltage cycle, easy to use and practical. 3) Small and easy to carry, no additional power supply.