On Sun, 2 Jun 2019 23:15:08 +0100, newshound wrote:

Another surprisingly good way to detect nails and hence studs is to use
a rare earth magnet suspended by a bit of thread as a sort of pendulum

Thinking of doing that to find floorboard screws under a fitted
carpet so that they can be tightened and hopefully stop noises from
the floor as you walk across it.

--
Cheers
Dave.