Many locators for underground pipes and cables can only trace from a known starting point , such as an exposed line, hydrant, or water faucet (conductive trace). However, the "two-box" M-Scope invented by Dr. Gerhard Fisher in 1931 can locate and trace any underground pipe or cable when no starting point is known (inductive trace). Today's TW-6 is a direct descendent of that first M-Scope invented by Dr. Fisher and is capable of conducting a "blind" search of an area for an underground pipe or cable that has no know starting point. Nonmetallic pipe may be located inductively or conductively if tracer tape or wire is placed in the trench above the line. M Scope Classic Shot

Using the 3-piece handle (Item P50502) position the Transmitter Box behind, while the Receiver Box is ahead. Walk a grid pattern to discover the location of buried metallic objects. Watch the meter on the TW-6 Transmitter Box and listen for the signal tone to discover the location of a metallic object, such as a pipe, cable or vault box. Mark the pavement with chalk for signal location. Soon a pattern will emerge that shows the location of the underground object you may be locating. If you are looking for a valve, tee or riser simply walk over the pipe and you will see a higher signal from the meter and hear a higher tone indicating a larger mass of metal. TW6 Indctive lcting lineart

When one point of a underground linear conductor (such as a pipe or cable) is known, place the Transmitter Box of the TW-6 over it and trace in either direction. Walk out the path of the line and swing the TW-6 Receiver Box left and right over the line while listening for the audio signal tone. As you walk away from the Transmitter Box tracing farther down the line, the Transmitter signal will become faint, but the Transmitter Box can be moved closer to you so that tracing can continue to the end of the line. Another alternative is to raise the sensitivity on the receiver.

Two Person Locating: Each person holds the units with its face towards him and parallel to the other instrument. Standing at least 30 feet away (to prevent air coupling), the two people walk parallel to each other from the curb toward the opposite side of the street. When the two operators are directly over the pipe the receiver will give you the maximum signal.

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This is the preferred method for tracing because the Transmitter Box makes a direct physical hook-up with the line to be traced. Plug the TW-6 Ground Plate Assembly into the Transmitter with one wire going to an alligator clamp that is attached to the pipe, non-energized wire or conduit. This concentrates the signal on the known line to be traced, and there is less chance of the signal being induced to a nearby or adjacent line. Tracing distances are increased 25-50 percent over the Inductive method. Nonmetallic pipes may be traced Conductively if the Ground Plate Assembly is attached to a plumber's "snake" or electrician's "fish tape" running inside of the pipe. TW6 condctive tracing lnart