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Stud finder
A stud finder (also stud detector or stud sensor) is a handheld device used to locate framing studs located behind the final walling surface, usually drywall. While there are many different stud finders available, they all fall into two main categories, magnetic stud detectors and electric stud finders.
==History==
Stud finders have been in use since the early 20th century, and all the first ones were all magnetic, relying on internal magnets to detect the walling fasteners presumably attached to studs. In 1977, Robert Franklin designed a revolutionary electronic stud finder that relied on an internal capacitor to measure changes in density behind the walling.〔(US patent 4099118 )〕 His patent was put into production by the Zircon Corporation, which became the sole producer of electronic stud finders until the patent expired in 1998. While novel, these electronic stud finders did not always prove effective in locating studs.
Since 1998, many developments and improvements have been made to the internal capacitor stud finders and increased their popularity. Recent innovators developed stud finders with multiple sensor plates that sense the wall in multiple places instantly. These sensors can indicate the location, width, and lack of studs simultaneously. With more sensors, these instant stud finders avoid the shortcomings of previous electronic stud finders, which require calibration and do not adapt to inconsistencies in wall construction. While the instant stud finders have made finding studs an easy and efficient task, many people still use magnetic stud detectors.〔http://thesweethome.com/reviews/best-stud-finder/〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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