Like a souped-up stud finder, the Multi-Detector finds things behind walls and tells you not only where they are, but also what they're made of and how deep they lie. It senses ferrous or non-ferrous metals, distinguishes between live and neutral wires, and can find steel up to 4 inches deep in concrete. When you've hit something, the big circle changes from green to red, and you can mark the spot with the golf pencil stored in a built-in nook. Approximately $99,

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