Fisher TW-6 Metal Detector

Locating large metal objects, cables, and pipes

The Fisher TW-6 metal detector is based on an invention by Fisher Research Laboratory Inc., made by the company in 1931. The distinguishing feature of the TW-6 is that the transmitting and receiving coils are separated, unlike most other metal detectors where both coils are integrated. This invention makes it possible to locate deep-seated metal objects such as oil tanks, manhole covers, metal pipes, and cables when there is no “starting point” to which a transmitter can be connected. Locating can be done in three different ways: Method A: with the transmitter and receiver attached to the carrying handle, allowing it to function as a metal detector. Method B: placing the transmitter above ground above the pipe and picking up and following the signal with the receiver. Method C: when there is a “starting point,” connecting the transmitter directly to the cable or pipe and picking up and following the signal with the receiver.