Worked For Me iPhone 4s 5.0.1b

Forgot my stud finder at the office. Figured "theres an app for that" and sure enough there is. Used it to find metal studs behind dry wall and thats what it did. Though not as good as a real stud finder since it doesnt detect the edges like a true stud finder but it is definitely better then trusting the knock on wall trick.

808mp5 about Free Metal Detector - Stud Finder and EMF Meter in One!