Features Locates the edges of wood and metal studs and joists behind walls, floors, and ceilings up to a depth of 1-1/2".. The spotlite pointing system shines a beam of light on the wall to identify the target, and wirewarning detection indicates live ac voltage.. Trucal technology calibrates to any wall's density and a steady green led light alerts the user when the tool is calibrated and ready to scan.. The tough, ergonomic housing withstands everyday jobsite use.. Dimension - 14 x 14 x 7 in.. Item weight - .4 lb..