Some stud finders also identify different materials behind your wall. In addition to the wood studs (or their steel screws) that all stud finders locate, some also differentiate between other ...

For our evaluations, we built a four-by-eight-foot wall from common materials: wood and metal studs; drywall; copper, black, pex, and PVC pipes; and nonmetallic sheathed cable. Then, we scanned ...