Recommended
A Look Inside Apple's $130 USB-C Cable
Why people recommend it
A CT scan comparison from Adam Savage's Tested, shared to show how much USB-C cables differ inside, from chips in the connectors to surprisingly few wires.
Watch for: Explains why cables vary, not how to test one
In their words
With so many USB standards with the insane amount of electronics that can go into them or not (check out this video using using Lumafield's CT scanning [video]) may not be nearly enough to "test" a cable.
iJames on electronics.stackexchange.com, Mar 2024. CC BY-SA.