DROK Mini OLED USB Detector Current Voltage Power Capacity Multimeter Amp Volt Measuring Watt Meter DC 5V 10V 2A Reliable charger doctor: our drop USB 3.0 digital Multimeter is a practical test tool which can be used to measure the Voltage current power capacity via your mobile device simultaneously it is a very convenient device to help you detect the if the output Voltage and current from the computer USB wall charger or USB car charger are in suitable range of your Cell phones and determine the power capacity of your portable battery pack Enormous data capacity: the USB power meter owns large data capacity which can contain 10 sets of capacity data 10 memories to keep track of charge delivered to devices over time (mAh), you can easily know if your power bank which without any indicators is full charged or NOT by the stored data the digital meter can also store the data automatically when power off Effortless one button operation: No need wires, No need screws, No need tools you can easily operate the USB meter by one button on the backside of the meter, even you are NOT an electronic expert by pressing the button, you can conveniently rotate the display 180 degrees, Clear or switch data Highlight intervals design: this excellent multiple USB detector adopts high quality OLED monitor which is bright, Clear and low power consumption and the USB tester features up its highlight intervals design which can prolong the life of the OLED screen and prevent aging compact and solid Made and humanized design, give you a soft use enjoyment Order without worry: in order to improve your confidence, we provide 100 percent risk-free guarantee to you therefore, do NOT miss this drop USB Multimeter which is ideal device for you to determine if your USB electrical devices are charging at their highest possible rate