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Fisher Labs TW-6 Pipe and Cable Locator

Download the brochureThe Model TW-6 “Two-Box” metal detector finds underground pipes, cables, manhole covers, vaults, valve boxes and other metallic objects.

It is used primarily by water departments, telephone companies, power companies, gas companies and petroleum pipeline companies when making repairs and rearranging lines.

The TW-6 shows where to dig, as well as where NOT to dig.

Fisher TW-6 ControlsTo increase the instrument’s sensitivity, Fisher engineers removed all unnecessary metallic parts on the TW-6, replacing them with durable ABS molded plastic. Coil windings are designed with completely upgraded electronics and nonmetallic parts have boosted the tracing distance of the TW-6.

In the Fisher tradition, the TW-6 is affordable, tough, and simple to use while providing maximum performance.

A two year limited warranty comes standard with the unit.

Main Features:

  • Crystal controlled frequency in both transmitter and receiver increases tracing distance.
  • Unlike other units that use a separate transmitter and receiver, the TW-6 when mounted on the handle, can conduct “blind” searches of an area to locate an underground pipe or cable when the starting point is unknown.
  • Weighs only 5 1/2 pounds.
  • Pipe & Cable Locator.
  • VCO (Voltage Controlled Oscillator) gives a wider range of audio signal to indicate the presence of metal. Even after the meter pegs, the audio signal goes much higher in pitch and volume.
  • Noise cancelling circuitry eliminates power line interference.
  • Powered by 16 standard AA (penlight) batteries: eight in the transmitter and eight in the receiver.


  • Receiver: Operating Frequency - 81.92 kHz + .005%
  • Sensitivity: Normal - 400 uV typical, High - 8 uV typical
  • Signal-to-noise Ratio: 110 dB
  • Batteries: 8 - AA
  • Receiver weight: 2 1/2 lbs.
  • Total Weight: 5 1/2 lbs. (without handle of accessories, ground plate assembly & op manual.)
  • Dimensions: 11.5” x 9” x 3”
  • Operating Temperature: -10° to +120° f
  • Transmitter Accessories: SR-81 Sonde Stereo Headphones, Fisher Phones, Nicad Recharge Battery System, Ground Rod Harness.

Optional Equipment:

  • Tracer Probe
  • Coupling Clamp
  • Sonde
  • Stereo Headphones
  • Fisher Phones
  • 3 pc Handle Kit
  • Hard Carrying Case