Electronic and battery-operated sensing and detecting equipment in the nature of stud finders, edge finders, center finders, AC voltage detectors, and metal detectors; electronic measuring devices in the nature of edge finders, center finders, metal detectors; tools to locate objects behind solid or opaque surfaces, or within solid materials, in the nature of electronic stud finders and metal detectors; utility detectors in the nature of electrical current detectors; and embedded recorded com...