With a Franklin Sensors stud finder, you have the fastest, easiest, most accurate stud finder on the market. To operate the ProSensor M210, simply press and hold the button then place it on the wall and go. There is no calibration procedure. You can instantly find studs. Once you have it on the wall, the LEDs show you right where the stud is. When you move the unit back and forth, the ProSensor M210 continues to track the location of the stud which makes it easy to instantly find the center and edges. Franklin Sensors stud finders are the most accurate stud detectors because they have more sensors. Other drywall stud finders typically have only 1 or 2 sensors. The ProSensor M210 has 13, making it the best stud finder for walls on the market. With Franklin Sensors' patented technology, you can find stud positions with unbeatable accuracy. The M210 uses capacitive sensors to detect changes in density, letting it be both a wood stud finder and a metal stud finder. The extra wide display on the M210 allows you to see the full width of objects such as double studs and multiple studs. The M210 also identifies live wires for extra safety. Additional features include a built-in bubble level and convenient pencil caddy to make it the perfect stud finder for mounting TVs, hanging and leveling pictures, or installing cabinets. Once you try the ProSensor M210, Franklin Sensors stud finders will quickly become your favorite.