From the Manufacturer
Positively locates nails and screws with powerful "neodymium"
magnets. The magnetic stud finder works like magic. It sticks to the
wall leaving your hands free--no batteries, no calibration, no lights,
no hassle. It works on wood or metal studs, and uses multiple industrial
strength magnets to “Field Vector” the stud. This is the last stud
finder you will ever buy. Simply slide the flat surface of the magnetic
stud finder slowly across a wall in a circular or "S" motion until you
feel a strong pull to a nail head or screw. Once you have the magnetic
stud finder directly above a nail head or screw, let it go and it sticks
to the wall.
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