Micro OLED usb 3.0. a brand new version from DROK. from USB 2.0 to USB 3.0, a great upgrade, it is a must-have tool for a geek.
it measure voltage, current, watts, power capacity, all in this little type package, and all this parameters display in one OLED simultaneously, lets you really do scientific study of how will the usb port is working.
we have add more interesting feature to this smart tool.
- Overvoltage and undervoltage alarm
- Screen flip-down function, Power down memory
- USB 3.0 Signal lines through does not affect communication.
- Scree off function, 9 group capacity storage.
- Capacity unit switching, automatic calibration current zero.
- Get more information detail, please check the reviews video. to show this usb multi-meter how to operating.
why you need this item
Determine whether the output voltage stability of power bank
Determine whether the charging voltage is safe. Prevent bad charge to your devices.
Voltage too high or too low will flash to remind, showing your charging voltage is abnormal, Whether need to turn off power.
Real-time display charging power
Real-time display charge current, it is clearly display the charging process. to determine charging or not, to identify fast/slow charge port or charging mode.
To test the power bank actual capacity, expose false parameter power bank.
Calculate Mobile power battery capacity and efficiency:
Ah data x output voltage ÷ Battery voltage ÷ Efficiency = mobile power battery Ah (output voltage is typically 5V, the battery voltage is generally based on 3.7V, efficiency is usually by 85-90%)
let us check below power adapter output status.