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Are there any devices for telling what HDMI or copper cables go together when running them through a wall?
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Tone chaser def the best here. Harbor freight (if op is USA) has shitty ones for like $10 that do the job fine.
If you can’t get one a multimeter in continuity mode with some long wire works if you’re tracing in one area. If it’s a huge area or across multiple rooms you can put low voltage on pins and use the meter to check for voltage on the other end. Make sure it’s not plugged in though