---
product_id: 47128012
title: "Southwire Tester; Continuity PRO 40040S"
brand: "southwire"
price: "$2167"
currency: MXN
in_stock: true
reviews_count: 13
category: "Southwire"
url: https://www.desertcart.mx/products/47128012-southwire-tester-continuity-pro-40040s
store_origin: MX
region: Mexico
---

# Precision voltage detection up to 9V Audible alert for hands-free testing Compact & durable for on-the-go use Southwire Tester; Continuity PRO 40040S

**Brand:** southwire
**Price:** $2167
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your diagnostics with Southwire’s Continuity PRO—where precision meets portability!

## Quick Answers

- **What is this?** Southwire Tester; Continuity PRO 40040S by southwire
- **How much does it cost?** $2167 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/47128012-southwire-tester-continuity-pro-40040s)

## Best For

- southwire enthusiasts

## Why This Product

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

## Key Features

- • **Clear Audible Alerts:** Stay focused with instant sound notifications that eliminate guesswork.
- • **Robust Build Quality:** Engineered for durability to withstand demanding job sites and daily use.
- • **Compact & Portable Design:** Fits effortlessly in your toolkit or pocket—ready whenever and wherever you need it.
- • **Trusted Industry Standard:** Backed by Southwire’s legacy powering half of America’s electrical infrastructure.
- • **Precision Voltage & Continuity Detection:** Accurately trace and verify cable runs with professional-grade sensitivity.

## Overview

The Southwire Tester Continuity PRO 40040S is a compact, reliable electrical testing tool featuring audible alerts and precise voltage/continuity detection up to 9 volts. Designed for professionals and DIYers alike, it offers durable construction and easy portability, making it an essential device for accurate cable tracing and troubleshooting across residential, automotive, and industrial applications.

## Description

Nearly one in two new homes built in the United States contains our wire, and we produce half of the cable used to transmit and distribute electricity throughout the nation. More than half of the world’s refined copper passes through one of our SCR systems, our tools & equipment business continues to grow, and our wire plays a key role in the manufacturing of other products, including automotive wiring harnesses and electrical motors. Southwire is a family-owned company operating in a globally competitive industry. As owners, we are proud of the company’s legacy and good standing in the community. Southwire’s success is rooted in hard work, social responsibility and innovation, and we believe that sustaining these core values is vital to the company’s future.

Review: Easy to use, compact and easy to carry, reliable - The Southwire Tester Continuity PRO 40040S is an outstanding tool for anyone needing a reliable and efficient continuity tester. From the moment I started using it, I was impressed by its accuracy and ease of use. The build quality is excellent, with a robust design that feels durable and long-lasting. The tester provides clear and quick readings, making it incredibly easy to diagnose continuity issues in various electrical circuits. The audible alert feature is particularly helpful, allowing me to focus on the task without constantly watching the display. One of the standout features is its versatility. Whether I'm working on wiring in my home, troubleshooting appliances, or handling automotive electrical systems, the Continuity PRO 40040S performs flawlessly. The compact size also makes it convenient to carry around and use in tight spaces. Overall, the Southwire Tester Continuity PRO 40040S has exceeded my expectations. It's an essential tool for both professional electricians and DIY enthusiasts, offering reliability, precision, and ease of use. Highly recommended for anyone needing a top-quality continuity tester!
Review: Accurate and reliable - Worked really well identifying control wiring on a machine after a newbie cut all the wires numbers off after a wire pull. Worked great.

## Features

- Clear Polarity & Continuity Detection: The Southwire Continuity Tester Pro uses audible alert power tester and built in continuity circuit tester features to trace and verify cable runs
- Easy-to-Use Volt Checking Tool: Our precision detector offers a simple and safe way to measure voltage
- Handy Power-Testing Tool: Our testing tools are compact and easy to carry, making them available whenever you need them
- Testing & Measuring Hand Tools: Southwire tools provide accurate readings and measurements you can trust
- Delivering Power Responsibly: Southwire is known for providing innovative products and services and delivering on our promises

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01ERZTIOM |
| Batteries | 1 Unknown batteries required. (included) |
| Best Sellers Rank | #235,877 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #308 in Circuit Testers |
| Brand | Southwire |
| Color | Remote |
| Date First Available | April 25, 2016 |
| Department | Unisex-Adult |
| Global Trade Identification Number | 00032886958397 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 6.7 ounces |
| Item dimensions L x W x H | 1 x 1 x 1 inches |
| Item model number | 40040S |
| Manufacturer | Southwire |
| Measurement Type | Ohmmeter |
| Min. Operating Voltage | 9 Volts |
| Power Source | 9v 1 |
| Product Dimensions | 1 x 1 x 1 inches |
| Style | Remote |
| UPC | 032886958397 |
| Upper Temperature Rating | 140 Degrees Fahrenheit |

## Product Details

- **Brand:** Southwire
- **Color:** Remote
- **Item Weight:** 0.42 Pounds
- **Power Source:** 9v 1
- **Style:** Remote

## Images

![Southwire Tester; Continuity PRO 40040S - Image 1](https://m.media-amazon.com/images/I/51vU5mpzDJL.jpg)

## Questions & Answers

**Q: Does the power have to be on in the circuit being tested for this tester to function?**
A: No, DO NOT use this on a live circuit! This is a continuity tester! You are looking for a break in the wire. If it doesnt light up, one of two things happened.  1. One of the wires is broken, on the wires you are testing and the wire or cable needs to be replaced. 2. The unit is defective and returned for replacement. Check battery inside to see if its good. My 1st one was defective and I had to replace it.

**Q: How to I test continuity for single long distance cable?**
A: ??  The continuity Pro sends a voltage, from the 9V battery in the main part, to the remote or alone to itself down 2 conductors.  When the used with the remote, it also detects polarity.  So, you always need 2 conductors with the remote, could be a pair of wires, one wire and a conduit or a long external wire you run separately.

**Q: whats up with the scanty cable?**
A: There's 2 small test leads. A known good and known bad. That way you can check to make sure the tester can accurately detect a good and bad cable

**Q: will this test continuity without running wires to each end of the circuit?  Like plug one end at source one end at receive and read that way**
A: Download the operating manual PDF at http://www.southwiretools.com/tools/tools/40040S for circuit continuity and polarity testing.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Easy to use, compact and easy to carry, reliable
*by S***. on June 10, 2024*

The Southwire Tester Continuity PRO 40040S is an outstanding tool for anyone needing a reliable and efficient continuity tester. From the moment I started using it, I was impressed by its accuracy and ease of use. The build quality is excellent, with a robust design that feels durable and long-lasting. The tester provides clear and quick readings, making it incredibly easy to diagnose continuity issues in various electrical circuits. The audible alert feature is particularly helpful, allowing me to focus on the task without constantly watching the display. One of the standout features is its versatility. Whether I'm working on wiring in my home, troubleshooting appliances, or handling automotive electrical systems, the Continuity PRO 40040S performs flawlessly. The compact size also makes it convenient to carry around and use in tight spaces. Overall, the Southwire Tester Continuity PRO 40040S has exceeded my expectations. It's an essential tool for both professional electricians and DIY enthusiasts, offering reliability, precision, and ease of use. Highly recommended for anyone needing a top-quality continuity tester!

### ⭐⭐⭐⭐⭐ Accurate and reliable
*by A***T on September 28, 2025*

Worked really well identifying control wiring on a machine after a newbie cut all the wires numbers off after a wire pull. Worked great.

### ⭐⭐⭐⭐⭐ good product
*by K***S on June 10, 2025*

a must have for finding short circuits

## Frequently Bought Together

- Southwire Tester; Continuity PRO 40040S
- Extech CT20 Remote and Local Continuity Tester , green,2
- Klein Tools ET310 AC Circuit Breaker Finder, Electric Tester and Voltage Tester with Integrated GFCI Outlet Tester

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*Product available on Desertcart Mexico*
*Store origin: MX*
*Last updated: 2026-02-20*