---
product_id: 18150317
title: "RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small"
brand: "ridgid"
price: "$2483.34"
currency: USD
in_stock: true
reviews_count: 10
category: "Ridgid"
url: https://www.desertcart.us/products/18150317-ridgid-21898-seektech-st-305-line-transmitter-line-tracer-underground
store_origin: US
region: United States of America
---

# 5W max power output Dual-frequency simultaneous transmission Battery-powered & portable RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small

**Brand:** ridgid
**Price:** $2483.34
**Availability:** ✅ In Stock

## Summary

> ⚡ Trace with confidence, locate like a pro!

## Quick Answers

- **What is this?** RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small by ridgid
- **How much does it cost?** $2483.34 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/18150317-ridgid-21898-seektech-st-305-line-transmitter-line-tracer-underground)

## Best For

- ridgid enthusiasts

## Why This Product

- Trusted ridgid brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Intuitive Operation:** LED-lit buttons and audio feedback ensure you’re always in control before tracing begins
- • **Precision Powerhouse:** Up to 5 watts of power for pinpoint line tracing accuracy
- • **Dual-Frequency Mastery:** Simultaneously transmits two frequencies to cut through interference and boost locating precision
- • **Versatile Connectivity:** Three connection modes—direct, surface induction, and clamp induction—adapt to any job site
- • **Field-Ready Portability:** Compact, lightweight design with extendable strap and ground rod for effortless transport and use

## Overview

The RIDGID 21898 SeekTech ST-305 is a compact, battery-powered line transmitter designed for highly accurate underground line tracing. Delivering up to 5 watts of power and supporting simultaneous dual-frequency transmission, it reduces interference and enhances precision. User-friendly LED-lit controls and audio feedback simplify operation, while versatile connection options and a portable design make it the go-to tool for professional utility locating.

## Description

Product Description Master your jobs with ease and accuracy with the RIDGID SeekTech ST-305 Line Transmitter (catalog number 21898). This advanced transmitter energizes metallic lines to provide highly accurate results and supports simultaneous transmission of two frequencies, enhancing versatility and precision. It delivers up to 5 watts of power and offers four selectable frequency options, ensuring effective line tracing with significantly reduced interference. Designed with user convenience in mind, the ST-305 features LED-lit buttons and intuitive audio feedback that verify circuit functionality before you begin tracing, making the operation straightforward and reliable. Our underground utility locator supports three connection methods—direct connection, surface induction connection, and induction connection via the separately sold SeekTech Inductive Signal Clamp—allowing for flexibility in various field scenarios. The transmitter's compact, battery-operated design includes an extendable carrying strap and a conductive ground rod, ensuring both portability and ease of use. This combination of features makes the RIDGID SeekTech ST-305 an ideal choice for professionals needing an efficient, reliable tool for underground utility work. RIDGID is a global manufacturer trusted by the skilled trades in more than 100 countries. BUILT FOR THOSE WHO KNOW. From the Manufacturer 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. Ridgid covers its products with a lifetime warranty against defects in material or workmanship for the life of the tool. The Ridgid 21898 Line Transmitter has 4 direct connect frequencies, 3 inductive frequencies and can simultaneously transmit 2 line frequencies. This transmitter has an automatic impendence matching system and has a maximum power output of 5 watts. Also it comes with variable power settings, low, medium and high.

Review: A must have for locating copper lines. - Product works as advertised. We added a valve on a copper line, located it with no problem. Ridged makes the best locating equipment for plumbers. Durable and made to last. Don’t try to use it in the rain.
Review: Found it - The device puts out a strong signal, my locating wand picked it up easily, and we tracked it down a hill right to the problem spot.. good purchase

## Features

- LINE TRACING TRANSMITTER: Energizes metallic lines for highly accurate line tracing and underground cable locating; simultaneously transmit two frequencies for enhanced versatility and precision
- POWERFUL AND COMPACT: Delivers up to 5 watts of power and features 4 selectable frequency options, ensuring precise line tracing and underground locating with significantly reduced interference
- USER-FRIENDLY OPERATION: Equipped with LED-lit buttons and intuitive audio feedback that confirm the circuit is functioning properly before you start tracing, making the process straightforward
- VERSATILE CONNECTIONS: Supports 3 different connection methods: direct connection, surface induction connection, and induction connection using the separately sold SeekTech Inductive Signal Clamp
- LIGHTWEIGHT AND EASY TO CARRY: The compact, battery-operated transmitter includes an extendable carrying strap and a conductive ground rod, offering both portability and convenience for fieldwork

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001NGPKKU |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Color | Yellow |
| Customer Reviews | 4.5 4.5 out of 5 stars (80) |
| Date First Available | December 24, 2008 |
| Included Components | Battery |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 2.4 pounds |
| Item model number | 21898 |
| Manufacturer | Ridgid Tool Company |
| Material | ABS |
| Part Number | 21898 |
| Power Source | Battery Powered |
| Size | Small |
| Style | SeekTech |
| Warranty Description | Full lifetime warranty |

## Images

![RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small - Image 1](https://m.media-amazon.com/images/I/41sS6TxJmcL.jpg)
![RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small - Image 2](https://m.media-amazon.com/images/I/41ybXKha5QL.jpg)
![RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small - Image 3](https://m.media-amazon.com/images/I/51+zpXrAwkL.jpg)
![RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small - Image 4](https://m.media-amazon.com/images/I/51Pl7qa62EL.jpg)
![RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small - Image 5](https://m.media-amazon.com/images/I/51ZyVNjV4DL.jpg)

## Questions & Answers

**Q: Can this be used with the seesnake ca12x**
A: It’s not a detector. This is the brick that charges metal lines or materials. The see snake has its own transmitter.

**Q: Could I use this tool to trace underground electrical circuits through conduit?**
A: Yes! This is exactly what it is designed to do. The depth of detection is dependent on the distance from the transmitter source, saturation, composition of the soil and the type of conduit, etc. Good luck!

**Q: I need a locator to find pvc waterlines indoor and outdoor. Will this work?**
A: You can but need to open the line and run a fish tape and connect to the fish tape to light the line

**Q: Will it give approximate depth**
A: The Ridgid 21898 is a transmitter, you will need to use any of Ridgid’s locator to have a reading of line or pipe depth. There are 4 locator models depending on your needs, SR-20, SR-24, SR-60 and NaviTrack Scout.  Sincerely America Tools

## Customer Reviews

### ⭐⭐⭐⭐⭐ A must have for locating copper lines.
*by J***E on April 10, 2021*

Product works as advertised. We added a valve on a copper line, located it with no problem. Ridged makes the best locating equipment for plumbers. Durable and made to last. Don’t try to use it in the rain.

### ⭐⭐⭐⭐⭐ Found it
*by P***E on April 12, 2024*

The device puts out a strong signal, my locating wand picked it up easily, and we tracked it down a hill right to the problem spot.. good purchase

### ⭐⭐⭐⭐⭐ Five Stars
*by J***S on December 1, 2017*

Great Product

## Frequently Bought Together

- RIDGID 21898 SeekTech ST-305 Line Transmitter, Line Tracer and Underground Line Locator,Yellow,Small
- RIDGID 21893 SeekTech SR-20 Locator, Line Tracer and Underground Utility Locator, Yellow, Small
- Ridgid 19238 Navitrack Scout Locator, Underground Pipe Locator And Cable Location Device Small

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-16*