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This effectively only tells you what the E-Marker reports though, the actual capabilities of the cable are still unknown.

You can say the cable can do whatever you want on the E-Marker, its not the source of truth.

The problem is, to actually benchmark everything, voltage drop, resistance, actual bandwidth (especially at Thunderbolt 5 speeds) requires a lot of hardware.

Using a USB-C Test Controller ($13,000), connected to a Pro Keysight Infiniium oscilloscope ($258,809) is the proper way to test it. https://www.keysight.com/au/en/product/N7018A/type-c-test-co...

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Yes and no..

Oscilloscope is needed for things like frequency response.

but most consumer care only the power loss and bandwidth only.

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well, that's disappointing; someone needs to miniaturize that and reduce the cost massively
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It’ll never happen. Measuring to the proper Thunderbolt spec is only possible on literally the most cutting edge measurement equipment. Physics just won’t permit that being a gadget you can buy for $20 of whatever.
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They are just catching up with ShowHN:

https://news.ycombinator.com/item?id=47972511

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It's not actually free, it's $14 to unlock all the features.
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Can't actually read the Verge without a subscription either.
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