Product Description: Features: - Brand new and high quality. - It can measure current and voltage of the power supply equpment with USB port. - Plug and play no extra power supply needed. - The voltage and current will be displayed circularly. - Small sized easy and convenient to carry. - Workable range: 3.5 - 7.0V 0 - 3A. - Resolution: voltage 10mV current 10mA. - Error range: voltage <1% current <2%. - Full-scale voltage drop:200mV. - Workable temperature: 0 - 60 degree. Color:Transparent; Black Package included: 1 x USB Current And Voltage Tester