No need for a back-and-forth motion because it scans as soon as it's on the wall or surface. Detector is easy to use in small spaces and features an ergonomic design. Because the Bosch D-tect 120 never needs calibration, you can focus on the job without worrying about the detector. Three modes studs, universal and concrete make this the right detector for more jobs. Device offers sound with light to show user when something is detected behind a wall, panel or under flooring.