Manufacturer: Fisher
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The TW-7700 Digital Line Tracer consists of a transmitter, receiver, ground-plate/ground-rod assembly, carrying case (hard or soft), and an operators manual. It is a single frequency line tracer. The TW-7700 is an active locating line tracer. There are three methods of active locating that an operator can use to trace a utility - conductive, inductive, and coupling clamp.


  • Depth Accuracy: +1 inch per foot in nominal conditions
  • Readout Units: Inches or cm (factory preset)
  • Left/Right Guidance:
    • Audio:
      • Continuous tone=Left
      • Pulsed tone=Right. VCO (varying pitch) output for easy over target location
    • Visual:
      • Left/Right/Over Target messages
  • Signal Strength: Digital numeric readout (0-99%) & bar graph
  • Sensitivity Adjust: Automatic
  • LCD Backlight: Included
  • Battery Test: Automatic Low Battery alert
  • Push button readout
  • Battery Type: Six ā€œCā€ cells
  • Battery Life: 80 hours
  • Weight: 5.4 lbs.
  • Operating Temperature: -4o to +140o F (-20o to +60o C)


  • Output Frequency: 82kHz
  • Output Power (nominal): 5watts
  • Battery Test: Yes
  • Battery Type: Two 6 volt lantern batteries
  • Battery Life: 80 hours
  • Weight: 5.0 lbs.
Subject to improvement or modification without notice