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This useful tool can detect metal pipes behind your walls the way a stud finder detects wall studs.

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a pipe finder works like a metal detector

The pipe finder from A.W. Sperry Instruments works like a metal detector. Its voltage adjusts to find the precise location of the metal. To use the tool, simply hold it up to a wall, and move it up and down. When the tool is directly in front of metal, its speaker sends out a signal.