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