Muker-J7, USB Multimeter

Rating: 5/5

The device certainly surpassed my expectation both with each quality and its functionality.
The screen is pretty large and the resolution is more than enough for the purpose.
Overall, the construction looks good and both connectors seem to be quality made.

Operating the device is pretty simple.The tester has to be placed in series with the charger and the cable. After the device has turned on,the user can scroll through the 3 different info screens using the button located in the top side of the device.

The tester can show the following info: Voltage, Current, Capacity, Energy, Charge time, Power, Temperature, Resistance and voltage of the different rails of the USB .
In addition its Voltage/Current range is : 3.0V ~ 30V/0 ~ 5.1A, which is more than enough for most tasks.

I have also went ahead and tested the voltage of one of my chargers using a high-end multimeter only to found out the reading of the usb tester is dead-on.

Product's link (non affiliate): Muker-J7
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