MMdex OLED USB 2.0 Detector Voltmeter Ammeter Power Capacity Voltage Current Tester Meter New function- it can support Qualcomm QC 2.0 quick charge This is the mini USB meter-it can measure voltage, current, power and capacity; it adopts the OLED screen, it can clearly display all the data. And it display two colors font, white and blue It has three functions-Screen rotation,Power-down storage andOver-voltage and Under-voltage reminding It forbid for being used for inductive load, eg: the load with motor and fan. it can be used digital products, eg: mobile phone,power bank,USB flash drive and etc.. Voltage measurement range:DC3.70 -13.0V ; Voltage accuracy: (0.3% + 1words) ; Current measurement range:DC0.00-3.00A ; Current accuracy: (0.5% + 2words) ; Power measurement range:0-30.00W ; Capacity measurement range:0-99999mAh