From Website Development Enterprises:
**Now Supports iPhone 4*****IMPORTANT MESSAGE PLEASE READ***Make sure you visit our site for more information including a step-by-step video demonstrating how to use your Studfinder Professional -- www.studfinderpro.comStudFinder Professional is the lightest, most proficient, and handy stud finder in the industry. Locate metal objects with a quick swipe of your iPhone. StudFinder Professional is the fastest, easiest, and most economical way to find metal objects on any stud. Why spend more money on an industrial stud finder, when you can own the StudFinder Professional?***INSTRUCTIONS***First, you should understand that Stud finders don't really find studs, they find the metal objects--nails or screws--that are embedded in the studs, SO you will know where the Stud is. A mistake often made by first-time users is to swipe a section of wall (left to right) without finding a stud, and then, wrongly concluding that there's something wrong with the device. The problem isnt the studfinder, its that you may be swiping an area where there are no nails or screws. The simple technique that we recommend at Studfinder Professional is to hold the iPhone flat against the surface, then press CALIBRATE and then begin a slow, left-to right swiping motion (approximately three feet to four feet). If you do have an unsuccessful swipe, simply go back to your starting point--raise the Studfinder Professional six-ten inches higher--hit recalibrate,-- and start a second three to four foot swipe. The key--until you locate a stud--is to keep going back to your starting point and raising your studfinder about six inches ("raising it up One iPhone length") and swiping again until you locate a nailed area of a stud. Remember to recalibrate before every swipe ("SLIDE").Youll find that your Studfinder Professional WILL produce the same results as a professional grade studfinder device purchased at the hardware store.