Zircon StudSensor Pro SL-AC Deep-Scanning Stud Finder
If you're looking for a basic unit or just a lower price, Zircon can help you. I've had one of these units for about five years now, and it works well for all my needs. While it isn't as fancy as some of the more expensive units, it finds studs just fine. This unit is an edge finder, locating the edge of studs for you and indicating their location with a LED and audio tone. It has both shallow and deep modes, with the deep mode operating up to 1-1/2 inches. If you accidentally start your scan over a stud, an indicator warns you, so that you can restart the scan.