I have bought 3 AT35 USB Testers and find them to be a great little tool. As mentioned above, they are small. That means the data display screen is also fairly small, and the font size of the data points is almost impossible to read if you have less than perfect (or properly corrected) close-up vision. Also, I really like this tool for its small size and light weight, which makes it a great addition to my toolbox as well as my desktop and home setup! I would recommend this one.
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