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Fisher SONDE-82.175 is an 82.175 kHz sonde for TW9000 line tracers. This self-contained transmitter helps locate non-metallic pipes, ducts, and blockages for fast, accurate underground tracing.

Fisher SONDE-TW6 SR-81 is an 81.92 kHz pipe signal transmitter designed for use with TW6 line tracers. Inserted into non-metallic pipe or duct via push rod, it enables precise underground pipe tracing and blockage location.