I have been planning to get either Witrn K2 or Power-Z KM003C. If just cable testing is enough, the Treedix one is probably good.
Related: If you are looking for cables, this guy has tested a bunch (mainly for charging capabilities) https://www.allthingsoneplace.com/usb-cables-1
Can these instruments measure bit error rates?
I'd expected to see at least characteristic impedance in that table.
And some metrics on internal reflections.