Photos by Luke Abaffy for ENR The iPhone beeps when its magnetometer, in the upper right of the phone, is near metal. Related Links: Stud Find App on the iTunes Store Stud Find is an iPhone application that uses the device's built-in magnetometer to find metal studs, screws, nails and anything metallic in a wall.The iPhone's three-axis magnetometer is an instrument that measures magnetic forces. Internal Apple software uses the instrument to position the phone's 360° orientation. Stud Find uses the magnetometer as a metal detector.Testing the app on an iPhone 5, we found it works best when moved slowly
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.