Patent ID: 8220332

Claim:
An apparatus for identifying an unknown route of a conduit in combination with a pull box or junction box, wherein said conduit comprises a plurality of inner-wall diameters and two end openings, comprising: an enclosure comprising a bottom panel, a top panel and four side panels; a sound generator located on an outside surface of said top panel of said enclosure, wherein said sound generator generates a dual-tone sound wave in a detectable sound range; said sound generator is coupled to one of said conduit openings but not in direct contact with said conduit; a detector located at one end of said conduit to detect said dual-tone sound wave in said detectable sound range; said detector located at one end of said conduit comprises an indicator to prove presence of said dual-tone wave in said detectable sound range; an aperture rotator located on top of said sound generator, wherein said aperture rotator to control the volume of said dual-tone sound wave; a power button located on an outside surface of one of said side panels to control an electrical power source to power said sound generator; a plurality of holding mechanisms located on an outside surface of one of said side panels and said bottom panel to provide substantial pull force to hold said enclosure firmly to the existing metallic pull box or junction box.