Stud finder
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A stud finder (also stud detector or stud sensor) is a handheld device used to determine the location of framing studs used in light-frame construction after the walling surface has been installed.
There are three main types of these devices. The first uses a small magnet to detect the nails or screws placed into studs during the manfacturing of the wall. The second type uses an internal capacitor plate to detect changes in the dielectric constant of the wall as the user moves the finder over the surface of the wall. A significant change in the dielectric constant indicates the presence of a framing stud. The third type uses a very small radar system to show exactly where the edges of a stud are behind the wallboard(sheetrock).
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