App Locates Metal Studs With iPhone's Magnetometer

摘要

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 along the wall being searched, with the right side of the iPhone held perpendicular to the surface-that's because the magnetometer is located in the upper-right corner of the phone.