I use that dirt cheap little yellow magnet that sticks to the wall when it fonts a drywall nail. Amazing stud finder. This one: https://a.co/d/0ar0hyjN
https://a.co/d/0gBXErpz
This never failed me - https://a.co/d/06qRgFtG
Never fails me … doesn’t locate a stud … instead, locates the nails that are used to mount sheetrock onto them. Each nail is a breadcrumb to help you track down the stud. https://a.co/d/06qRgFtG
