Old plaster walls can provide challenges when locating wall studs. We show 2 options to finding studs in a very old house.
1) Neodymium Magnets
https://www.amazon.com/gp/product/B06...
2) Zircon Stud Finder
https://www.amazon.com/gp/product/B07...

This old house renovation that we are taking on will leave some of the interior walls in tact. Being able to find where the studs are located is of course a big help.
You could use a super simple method of rare earth magnets or neodymium magnets to find nils below the surface of the plaster and lath. But this method, though inexpensive, requires a bit of patience and even then you may get mixed results.
The second and more reliable method is to buy a stud finder with deep scan capability.
We are using a Zircon stud finder with the ability to scan through 1.5 inches of wall material. This stud finder makes the process much easier and with more consistent results.

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