MPC-REX, Locator Multi-Frequency Combo KitMPC-REX Includes Only:GA-92XTd Magnetic LocatorRex Multi-Frequency Pipe & Cable LocatorHolster (p/n: PC10012)Conductive Clip Assembly (p/n: TM70000) which includes Standard Conductive Clips - C91010 (Red) and C91011 (Black)Soft Shoulder Bag (holds receiver, transmitter, accessories)Ground Stake (p/n: 208263)Power Supply & Cord for Transmitter chargingPassive 50/60 HzIn passive mode, the transmitter is not used at all. Instead, the receiver searches for an appropriate harmonic of 60 or 50 Hz signals (factory preset). These signals are typically present in energized power cables, making it possible to locate them without using a transmitter to impose a tracing signal onto them.ConductiveIn conductive mode, the transmitter imposes a signal of the selected frequency onto the pipe or cable to be traced. It does so by making direct contact with the pipe or cable at a point where the pipe/cable comes up to the surface of the ground (a transformer box, a water hydrant, a telephone switch box, a gas meter, etc.). The circuit is closed by providing a return path with a stake that is buried in the ground near the transmitter.InductiveIn the inductive mode, the transmitter imposes a signal of the selected frequency onto the pipe or cable to be traced. It does so by energizing an inductive antenna built into the case. The transmitter is placed on the ground in a direction perpendicular to the pipe or cable being traced. The inductive antenna then induces a current onto the pipe or cable. In this mode, it is not necessary to provide a return path for the induced current to the transmitter. The induced current will travel on the pipe or cable for a certain distance, making it possible to trace it.SondeIn sonde mode, the transmitter is not used at all. This mode is used to trace nonmetallic pipes, or metallic pipes where other modes are inapplicable or inefficient. A small beacon transmitter, or sonde, is pushed through the pipe, and the receiver searches for the signal emitted by the sonde.Since the signal being traced by the receiver is produced by the sonde and not travelling along the pipes, there are some differences in the way the receiver is used. Due to the nature and strength of the sonde signal, it is necessary to have some idea of where the sonde is (in order to narrow the search area to a radius of several feet centered on the sonde).