Sewer pipe detection device 512hz pipe inspection camera receiver pipe Locator for Pipe Inspection Receiver: The receiver has a built-in induction coil to receive the magnetic signal from the pipeline, and the coil nerates an induced current to calculate the direction and position of the transmitter. There are two receiving modes: Far (note: about 5M) and Near (note: about 1 meter). Then adjust the sensitivity knob, peak mode (maximum) or null mode (minimum) to locate the transmitter.