With a Franklin Sensors stud finder, you have a fast, easy, accurate stud finder you can rely on. To operate the ProSensor M10, place the unit firmly against the wall, then press and hold the button. The LEDs will quickly illuminate indicating it is ready for scanning! When scanning, the LEDs show you right where the center of the stud is. When you move the unit back and forth, the LEDs on the M10 will illuminate in sequence until the top LED turns green - pinpointing the center of the stud. Franklin Sensors stud finders are the most accurate stud finders because they have more sensors. Other stud finders typically have only 1 or 2 sensors. The M10 has 3. With Franklin Sensors' patented technology, you can find stud centers with unbeatable accuracy. To prevent false readings, always place the unit on the wall before pressing the button. As you scan, ensure the unit never lifts but is continuously pressed against the wall. The ProSensor M10 is the perfect tool for many projects ranging from hanging pictures to mounting curtains and hanging shelves. Once you try the ProSensor M10, Franklin Sensors stud finders will quickly become your favorite.