A tool and method of using the tool for positioning electrical outlet boxes and data transmission outlet boxes for installation behind or within walls during construction or renovation of commercial buildings. The tool can be used to install one, two or three electrical outlet boxes at a desired wall height and horizontal spacing from a wall stud with efficiency, ease and precision. With the tool, the outlet boxes can be accurately installed at heights ranging from twelve to fifty two inches, and even as high as eighty inches above the floor. The tool provides a beveled edge template for the marking of a single gang or two gang outlet on a sheetrock wall, affording accuracy in tracing and then cutting of the holes needed to install the outlet boxes. The tool also can fit within a sheet metal floor track, and stands vertically in flush contact with the sheetrock wall.