and wall-mounted office monitors. Bosch’s GMS120 is more than just a stud finder (though it located the centers of those we tested it on within an eighth of an inch). It also detects live AC ...

and venting the fans out of an exterior wall. I needed a stud finder for every one of those steps. Having a reliable and accurate stud finder is also useful for simpler projects like mounting TV’s on ...

The Bosch Professional Stud Finder GMS 120 ($74.11 at Home Depot) uses this technology. Walabot makes a sensor that pairs with a cellphone to provide images showing hidden objects within a wall.