Stud finder

[citation needed] In 1977, Robert Franklin designed an electronic stud finder that relied on an internal capacitor to measure changes in density behind the walling.

Since 1998, many developments and improvements have been made to the internal capacitor stud finders and increased their popularity.

With more sensors, these stud finders do not require calibration and adapt better to inconsistencies in wall construction.

The strongest attraction point, if due to a metal fastener in the wall, should indicate the location of a stud.

Magnetic stud detectors may be less useful in homes built with metal mesh lath and plaster.

Because a moving magnet is able to notify the user both audibly and visually, it is not dependent on the operator to feel the attraction to the metal.

Electronic stud finders rely on sensors that detect changes in the dielectric constant of the wall.

Internal capacitor stud finders can also come with other features that locate metal and live AC voltage.

They use an algorithm to analyze the readings from the multiple sensor plates for a quicker, more accurate indication.

[citation needed] Because the instant stud finders use multiple readings to determine the location of studs they are also less vulnerable to construction anomalies (such as uneven paint, wall textures, wallpaper, uneven plaster, etc.)

One of their advantages is the ability to work on older houses, such as ones with lath and plaster wall types.