Transmitter The Ridgid SeekTech ST-305 transmitter is designed for users needing additional portability while locating utility lines. The lightweight, compact transmitter is made to be used with the company's SeekTech SR-20 utility locator, which traces underground utility lines. The ST-305 has adjustable power output, transmits at up to 5W of power, and has four frequencies: 1 kHz, 8 kHz, 33 kHz,
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