The Uni-T UT658 is a handy measuring tool in a USB adapter format that you simply connect between the charger and the device. It displays operating values in real time and helps reveal voltage drops caused by a poor-quality cable or a weak power source.
It is suitable for everyday charging diagnostics and for comparing the performance of different chargers and cables. The capacity measurement function also indicates how much energy was actually transferred to the device, and the memory makes it easier to compare results later.
Main benefits and features:
Note: The tester operates in the 3–9 V range, so it is not intended for testing fast-charging modes that use higher voltages (e.g., 12 V and above).
