---
product_id: 2175252
title: "Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work"
brand: "extech"
price: "$2742"
currency: MXN
in_stock: true
reviews_count: 8
category: "Extech"
url: https://www.desertcart.mx/products/2175252-extech-ct20-remote-and-local-continuity-tester-with-remote-probe
store_origin: MX
region: Mexico
---

# Tests cables up to 10,000 ft 85dB loud audible tone 9V battery powered for portability Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work

**Brand:** extech
**Price:** $2742
**Availability:** ✅ In Stock

## Summary

> ⚡ Trace with confidence, test with ease — the CT20 keeps you wired for success!

## Quick Answers

- **What is this?** Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work by extech
- **How much does it cost?** $2742 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.mx](https://www.desertcart.mx/products/2175252-extech-ct20-remote-and-local-continuity-tester-with-remote-probe)

## Best For

- extech enthusiasts

## Why This Product

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

## Key Features

- • **Rugged Field-Ready Design:** Professional-grade alligator clips and a tough housing ensure secure, reliable connections no matter the worksite conditions.
- • **Solo Cable Tracing Mastery:** Detachable remote probe enables one-person operation across long distances up to 3,000m—ditch the assistant and own the job.
- • **Versatile Multi-Industry Use:** Perfect for electricians, HVAC pros, telecom installers, and automotive technicians tackling complex wiring challenges.
- • **Clear Signals in Any Environment:** Bright bi-color LEDs paired with a loud 85dB beeper cut through noise and darkness for instant continuity confirmation.
- • **Compact & Lightweight Powerhouse:** Weighing just 0.1 kg and powered by a standard 9V battery, it’s the ultimate portable tool for on-the-go diagnostics.

## Overview

The Extech CT20 Remote and Local Continuity Tester is a professional-grade electrical testing tool designed for fast, accurate cable continuity checks up to 10,000 feet. Featuring a detachable remote probe for single-user operation, bright LED indicators, and a loud audible tone, it excels in noisy or complex environments. Rugged and lightweight, powered by a 9V battery, it’s ideal for electricians, HVAC, telecom, and automotive professionals needing reliable, hands-free cable diagnostics.

## Description

Product Description The Extech CT20 Remote & Local Continuity Tester is built for technicians who need fast, reliable cable tracing without unnecessary complications. Designed with a remote probe that lets you test long cable runs across rooms, floors, or large installations, the CT20 makes it easy to identify wiring faults without requiring an extra set of hands. This professional-grade tool offers both audible tones and bright LED indicators, providing immediate confirmation of continuity even in challenging work environments. Whether you're working on telecom lines, HVAC control wiring, security systems, automotive circuits, or low-voltage electrical installations, the CT20 delivers the accuracy and efficiency needed to diagnose issues quickly. Lightweight, portable, and rugged enough for field conditions, the Extech CT20 is the go-to continuity tester for electricians, installers, and maintenance technicians who demand dependable performance and streamlined operation. From the Manufacturer An electronic tool for electricians, alarm, cable installers and others who routinely need to check circuits for continuity and also identify cables and wires. It allows a single user to quickly identify and label two wires even when the wire ends are located in different rooms.85dB beeper. Tests wire lengths up to 10,000-Foot (3,000m) 26 gauge minimum. CE approved. Complete with Continuity Tester, Remote Probe with Bi-Color LED, 9V battery, and carrying case.

Review: Great product - I haven't had it long, but I bought with a need to trace some electrical wires at a couple of sites and it hasn't disappointed me yet. It's been working great. As others have mentioned, if you're only tracing 1 wire, you can attach the other (black) lead to ground with the main device and the remote, and the red lead to the wire you're testing, and that works. It's been pretty accurate for me up to 50 feet, which is all I tested. Highly recommended for your electrical toolbag, and I'd definitely buy it again. Worth it at this price for the time it's saved me.
Review: Does what it says - Received today and really helped me find my issues

## Features

- RELIABLE CONTINUITY TESTING: Quickly check for shorts and opens in cables and wires. Perfect for electricians and DIYers working on home wiring, automotive circuits, or remote cables.
- ONE-PERSON OPERATION: Features a unique detachable Remote Probe that allows a single user to identify and label long-distance wire runs (up to 10,000ft/3,000m) without needing an assistant.
- LED & AUDIBLE INDICATORS: Bright flashing LED and loud pulsating beeper provide clear signals even in noisy environments. Includes a "Local" and "Remote" mode to ensure total circuit accuracy.
- 9V BATTERY POWERED: (Note: 9V battery required/not included). If the unit does not power on, ensure the battery is seated firmly against the terminal clips.
- HEAVY-DUTY DESIGN: Built for the field with a rugged housing and professional-grade alligator clips for secure connections during testing.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Extech |
| Color | green |
| Item Weight | 0.1 Kilograms |
| Item dimensions L x W x H | 2.2 x 1.14 x 3.6 inches |
| Power Source | Battery Powered |
| Style | CT20 |

## Product Details

- **Brand:** Extech
- **Power Source:** Battery Powered
- **Style:** CT20
- **Color:** green
- **Item Weight:** 0.1 Kilograms

## Images

![Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work - Image 1](https://m.media-amazon.com/images/I/61+OCrw3jxL.jpg)
![Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work - Image 2](https://m.media-amazon.com/images/I/710SE3n3p9L.jpg)
![Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work - Image 3](https://m.media-amazon.com/images/I/71YnTuNcNgL.jpg)
![Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work - Image 4](https://m.media-amazon.com/images/I/71gAjgGxBnL.jpg)
![Extech CT20 Remote and Local Continuity Tester with Remote Probe, Audible Tone, Long-Distance Cable Testing, LED Indicators, Hands-Free Operation for Electrical, HVAC, Telecom and Low-Voltage Work - Image 5](https://m.media-amazon.com/images/I/71uSGlk27bL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Can this device be used to test the continuity of a single conductor wire instead of a conductor pair?**
A: I wondered about that  too so I asked my son in law he's an electrician according to him you can't do it remotely but it can be done without the remote option as  long as you can get to both ends of the single wire which makes this device useless in most cases because most of the wires I would want to remotely test are single wire

**Q: how many feet can be tested at one time ?**
A: Not sure what your asking about how many feet? It is for finding continuous flow in wiring if your not sure which wire goes where. This is a video I used to help me to figure out a 4 way switch setup. http://www.thisoldhouse.com/toh/tv/ask-toh/video/0,,20785338,00.htmlHope it helps.

**Q: Hooking tester in panel box is a probl locating grnd and neg. Can you attach rem to grounding bar to test for neg and grounding wire continuity?**
A: You can test everything you want as long as the object that you want to test is de-energized

**Q: do the units require any kind of recalibration or servicing to ensure it is still working correctly**
A: No, none that I know of.  It works fine and comes with instructions.  It saves a lot of time and trouble, especially if you are working alone.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product
*by A***B on October 10, 2019*

I haven't had it long, but I bought with a need to trace some electrical wires at a couple of sites and it hasn't disappointed me yet. It's been working great. As others have mentioned, if you're only tracing 1 wire, you can attach the other (black) lead to ground with the main device and the remote, and the red lead to the wire you're testing, and that works. It's been pretty accurate for me up to 50 feet, which is all I tested. Highly recommended for your electrical toolbag, and I'd definitely buy it again. Worth it at this price for the time it's saved me.

### ⭐⭐⭐⭐⭐ Does what it says
*by K***. on May 12, 2025*

Received today and really helped me find my issues

### ⭐⭐⭐⭐⭐ Good Value and Simple To Use
*by J***A on August 16, 2025*

Ignore the bad review in the Video clip by some bearded dude with long hair wearing a floral dress ?! Yes, the product does come complete with a 9-volt battery ( "not a deal breaker"), and secondly the loose clip for the accessory detector should only be used when storing the product away in the provided carrying case / pouch, which if I had anything negative to say about, could have been made slightly larger in size to better accommodate.

## Frequently Bought Together

- Extech CT20 Remote and Local Continuity Tester
- Southwire Tester; Continuity PRO 40040S
- Klein Tools 80016 Circuit Breaker Finder Tool Kit with Accessories, 2-Piece Set, Includes Cat. No. ET310 and Cat. No. 69411

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-01-24*