Save your mom hours of frustrations (and the cost of wall repairs) when she hangs those heavy family portraits with the MultiScanner i520 OneStep. The hand-held device, an upgrade of Zircon's well-known original scanner—can locate the edges and center of wood and metal studs and joists behind walls, floors, and ceilings. It also locates rebar and copper pipes. With all that information, your mom might not need to spend on a pro for some of her home improvments.
About $55, Zircon