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This little gadget to find out which type of USB-C cable you have
(discuss.tchncs.de)
This is a most excellent place for technology news and articles.
Hmm... This looks like something that could just work as software on a PC, or as an app on a phone. I'd be surprised if it doesn't already exist.
You need both ends of the cable connected, so the phone is out. And even on PC, I'm not sure if it would work with the USB drivers in-between the software and the actual ports