Maybe specific, but if you do any DIY housework, get an endocscope. Baiscally, a 10 foot long flexible wire with a camera and light at the end. Uses your phone as a screen. Can be had for <$50. So many of my house projects would have been impossible without it. Also good for finding stuff under the couch.
I got one on wish like 10 years ago and it's still works fine today! Do your research though because some say "1080p" but gives you only 120p! lol
Also, Temu is the new wish! 😂
They're usually just basic USB cameras so any generic camera app that supports USB cameras will work with them. I use an app called CameraFI 2 on Android.
Could've used one of these yesterday. My father-in-law needed help mounting a TV and we couldn't find a stud to save our lives. We eventually discovered that the wall had deep studs due to ½ inch chipboard in addition to the ¾ inch drywall. We literally start randomly hammering nails into the wall to find the studs, which led us to that discovery.
I recently bought a metal detector/stud finder for that exact reason. I also am an electrician and have to find studs or rebar often when drilling and it's been great for that too. In your case it would work by detecting the nails in the studs instead of looking for the studs themselves. I got the Zircon Metalliscanner (I believe)
I think I was literally using that exact same stud finder. We were getting very sketchy hits on where the studs were located, so we started probing and found the issue.
I had something very similar - a wall with old wood paneling that had been painted so you can't tell it's wood paneling any more. My stud finder was having a hard time due to the thickness of the wood on top of the drywall. I drilled a hole and stuck my little USB camera in there. Life saver.