Stud finders will let you know where a stud is in the wall but not where it starts and ends, so the Ryobi Whole Stud Detector is intended to help solve this problem. The new device from Ryobi will detect where a stud is and let you know where the beginning and end of it is so you know exactly what you're working with. Aside from letting you know the width the tool will also let you know how deep the drywall that it's on is as well as other materials such as wires that might be present. This ensures that you'll never have to worry about hammering or drilling into something you shouldn't ever again.
The Ryobi Whole Stud Detector has a built-in button that will mark the area to let you know where the measurement took place once you have put the tool down.