For less than $4, *delivered*, I don't really expect it to replace a very expensive cable analyser.

But then, the Cat-5(e) labelling on the cable itself generally assures the ability to carry a signal, especially in a mostly straight/protected run inside conduit.

In real life, nearly all faults are of the connection variety, and the little DX gadget is quite adept at pointing them out.

Given that there are two such cables in the conduit here, I find it rather unlikely that the cables themselves are BOTH bad; it's much more likely they've not been terminated correctly, or that the GigE switch at one end might be the culprit.

Cheers