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this post was submitted on 01 Sep 2023
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Wire tracker maybe? You might want a higher quality version than that particular one if the cable run is long, one of the reviews suggest that the distance is limited.
This one here does time domain reflectiometry which will tell you exactly where the break is:
https://www.amazon.com/Ethernet-NF-8209-Distance-Location-Measurement/dp/B08M3SRB2Q/
I was curious if that would work on ethernet cable! I've seen it done on coax, wasn't sure if it would work well enough on UTP to be useful outside a lab setting. Cheap too. Cool!
Some of the reviews say it didn't work for them to find a break, but I have that exact one and have had good luck with it. So YMMV. Obviously the ten times the price Fluke will do better.
TDR isn't exactly rocket science and the speeds needed to do it are surprisingly reasonable. You can build your own for a few bucks if you have an oscilloscope as well.