It shows a lot of useful information such as voltage, current and power as well as the protocol used. It comes with a cover over the USB port and is quite small making it safe and convenient to carry around. I didn't check any of the numbers for accuracy, but they looked reasonable. The only problem I have is reading the results. It just so happened that the main hub I wanted to test was placed where the device's readings were pointing at the window, and I couldn't stick my head in between to easily read the results. I couldn't turn the charging hub over without disassembling it to make it easier to read the results. The display on the tester did not rotate or rotate. Going outside and looking out the window seems to work, but the crowd is small. I tried the mirror but then I got really confused! I had another charging hub that was exactly the same but didn't have it installed so I could easily test it. I find the tester useful and informative. I would buy again and recommend.
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