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Aubuchon Hardware Tip: Some stud finders are magnetic and can locate nails rather than studs. If you are having bad luck with a magnetic stud finder, try switching to a model that detects changes in density rather than using a magnet to locate the stud. These density-change stud finders can give you much more accurate results, but do require nine-volt batteries. For the most accurate readings, it's important to make sure you have fresh batteries.