Madison Electronics Tracer Tool accurately and easily traces 2" x 3" metal or plastic old work box outlines on surfaces for proper installation in walls, centering the box to match any existing. Integrated vertical and horizontal levels and center point location mark allow for quick and easy placement of the tracer. Made of durable plastic, the Tracer Tool has a rubber backing for turning ease and pliability to surfaces when tracing. Small and easy to use, it works both vertically and horizontally with bull’s-eye accuracy. Use alone for metal boxes, or snap on the included plastic adapter for plastic boxes. Patented.