Your Fisher Model TW-6 allows two modes of operation: INDUCTIVE and CONDUCTIVE. In the INDUCTIVE mode, the Transmitter induces the electromagnetic eld around the object sought. The Transmitter radiates this eld through both soil and water. INDUCTIVE is subdivided into two modes: (1) On the handle for LOCATING and (2) Transmitter placed on the ground directly above and in line with the conductor for TRACING and the path of the conductor.
The CONDUCTIVE mode operates when you connect the Transmitter directly to an exposed portion of the pipe or cable in question with the Ground Plate Assembly