Ridgid ST-305 Line Transmitter


  • Lightweight and compact transmitter that delivers up to 5 watts of power (3 power output settings) for line locating, underground cable location, and more
  • Transmit 2 frequencies simultaneously
  • Easy to use – Convenient buttons with LED light indicators, audio feedback confirms a good circuit before beginning a trace, and easy carry straps
  • Generates frequencies: Direct Connect – 1 kHz, 8 kHz, 33 kHz, 262 kHz*; Induction – 1 kHz, 8 kHz, 33 kHz, 262 kHz*
  • Terminal leads attach using clips or built-in magnets and have built-in edge to paint scrape for optimal connection to pipe, ground or connection point


Call us at (480) 788-9849 for pricing and availability

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$40 $200 $50


  • The SeekTech ST-305 includes the 5-watt line transmitter to energize metallic lines for tracing with extendible carry strap, ground spike, and lead clamps. Can conveniently fit in SR-20/SR-24 and SR-60 Cases (Not Included).

    Uses 3 connection methods: Direct Connection, Induction Method with SeekTech Inductive Signal Clamp 20973 (Sold Separately), surface induction (align lines on the unit with the pipe in the ground).

    Buttons and LED indicator lights on the unit to set the frequencies (1, 8, 33, 262 kHz*) set induction, and control the power button and power output (low is 1/2 watt; medium is 2 watts; and high is 5 watts). Can simultaneously transmit 2 frequencies at one time.

    Since 1923, RIDGID has remained the symbol of certainty to dedicated professionals of the expert trades. Every tool that bears the RIDGID brand is engineered to the same high standards of quality, strength, and endurance, as was that first heavy-duty pipe wrench more than 80 years ago.

    *Up to 93 kHz for devices sold in Europe.

  • Additional Information

    Weight 1 lbs
    Dimensions 8 × 5 × 3 in
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