harley
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Actually, they find the nails in the studs.
Obviously some of us still use previous century tools. Magnetic stud finders are so 1980.
The newer ones use either radar or some sort of capacitance differential that I don't quite understand. But they find the edges and the center of the stud, with nails or without.
You probably use one of those levels with the water and the bubble, too. The future is lasers, kid!