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  • Lightweight and compact transmitter that delivers up to 5 watts of power.
  • Can transmit two frequencies simultaneously.
  • Audio feedback confirms a good circuit before beginning a trace.



Direct Connect 1 kHz, 8 kHz, 33 kHz, 262 kHz.*
Induction 1 kHz, 8 kHz, 33 kHz, 262 kHz.*
* Up to 93 kHz for devices sold in Europe.

Support Documents

Parts List

Ordering Information

Catalog Number Description Weight
lb. kg
21898 SeekTech ST-305 Transmitter  2.5  1.9  Buy Now
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How far does this emmit a signal?

I work fixing irrigation on the athletic fields for Arlington ISD. Will this transmitter emmit a signal that can be read 2. thousand feet away.. We currently own the Seek tech Sr 20.We have large areas that is run off of one irrigation controller. We need something that will help us trace individual wires separately to help find wire breaks or missing valves.. Thank you!
Asked by: Ranger
Hello, thanks for contacting RIDGID. With all of the different factors that can come into play I'm not able to answer this question directly without more information. Please contact our technical services at 800-519-3456 for more information on your question.
Answered by: RIDGIDSupport
Date published: 2017-10-02
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