Electronic apparatus to find studs in walls; and tools to locate objects behind solid surfaces and within solid materials, in the nature of electronic stud finders, electronic edge finders, electronic center finders, AC voltage detectors, and metal detectors

Electronic apparatus to find studs in walls; and tools to locate objects behind solid surfaces and within solid materials, in the nature of stud finders, edge finders, center finders, AC voltage detectors, and metal detectors

electronic apparatus to find studs in walls