Ryobi Whole Stud Detector
Normal stud finders beep when it finds a stud, but leaves it up to you to try and figure out where it begins and ends. The Ryobi Whole Stud Detector uses a series of LEDs at the top to show you the entire width of the stud. It can also tell you how deep the drywall is, detect wires and other materials inside the wall, and once you've found the stud you're looking for, it has a button that will mark the center with a dimple so you can find it again.