---
product_id: 509901809
title: "RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time"
brand: "klein tools"
price: "A$377"
currency: AUD
in_stock: true
reviews_count: 11
category: "Klein Tools"
url: https://www.desertcart.com.au/products/509901809-rt390-circuit-analyzer-with-large-lcd-identifies-wiring-faults-gfci
store_origin: AU
region: Australia
---

# Load testing at 12A, 15A, 20A for voltage drop Large color LCD for clear diagnostics Dual AFCI & GFCI fault detection with trip time RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time

**Brand:** klein tools
**Price:** A$377
**Availability:** ✅ In Stock

## Summary

> ⚡ Power Up Your Safety Game with Klein’s RT390 – The Ultimate Circuit Analyzer for Pros Who Demand More!

## Quick Answers

- **What is this?** RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time by klein tools
- **How much does it cost?** A$377 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/509901809-rt390-circuit-analyzer-with-large-lcd-identifies-wiring-faults-gfci)

## Best For

- klein tools enthusiasts

## Why This Product

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

## Key Features

- • **Instant Visual Clarity:** Large, vibrant color LCD delivers easy-to-read, detailed wiring fault results at a glance.
- • **Load Testing Precision:** Measures voltage drop under 12A, 15A, and 20A loads to pinpoint hidden electrical inefficiencies.
- • **Smart Power Management:** Auto power-off after 5 minutes preserves battery life so your analyzer is ready when you are.
- • **Professional-Grade Durability:** Rugged design with detachable cord built to withstand daily jobsite demands and organized storage.
- • **Comprehensive Safety Assurance:** Detects both AFCI and GFCI faults plus dual wiring issues like open neutral and ground for unmatched protection.

## Overview

The Klein Tools RT390 Circuit Analyzer is a professional-grade electrical tester designed for North American 120V AC outlets. Featuring a large color LCD, it identifies wiring faults including AFCI and GFCI issues, measures trip times, and performs precise voltage drop load tests at 12A, 15A, and 20A. Its rugged build, detachable cord, and smart auto power-off make it an indispensable tool for electricians, inspectors, and serious DIYers aiming to ensure electrical safety and performance with confidence.

## Description

The Klein Tools RT390 is a Circuit Analyzer that tests the wiring conditions at an electrical outlet, displays AC line voltage, inspects AFCI and GFCI devices with time to trip device, and performs voltage drop tests at 12A, 15A and 20A current loads. Results are easy to understand with large, color LCD. The tester is designed for use with North American 120V AC 3-wire electrical outlets. For more than 160 years, Klein Tools has manufactured premium-quality, professional-grade hand tools that deliver the performance, durability and precision needed to get the job done right. Our family of engineers, workers and craftsman continue to put six generations of expertise into every tool we create by using only the highest quality materials, superior workmanship, and keeping manufacturing as close to home as we can. Klein isn't just the name of our company, it's also our family name. And since we're an American company that's family-owned and family-run, you know you can count on us to be here tomorrow. Klein Tools doesn't just make great products, we make great products that stand up to the demands of the professionals who use them every day ... Since 1857.

Review: Standalone best wiring integrity tester! - One has the option of a number of GFCI testers of which the Klein RT 310 and 350, the Fluke Pro 120+ are generally the best. But there's a new king in town. The RT390 is expensive and bulky, but it absolutely demands to be in the kit of any home inspector, safety inspector, electrician, or any homeowner who plans to do more than incidental work on their electrical systems. First, the arrival of AFCI's and especially hybrid AFCI/GFCI's has changed the outlet tester game. These breakers, Arc Fault Circuit Interruptors, detect arcs in the wiring and are most effective in identifying and protecting against electrical fires (GFCI's protect more directly against shocks emanating from the outlet and attached products). Most outlet testers don't test AFCI's. The Klein RT250 is a basic GFCI tester. Bump up to a RT310 and you get AFCI testing as well, but there's no diagnostic capability in the 310 -- it's a simple go/no-go tester that can't tell you anything about what's wrong. The RT350 does a bit more, but doesn't generate enough data for you to figure out what's wrong or how to fix it. I wouldn't generally recommend the 350 now that the 390 is available. The RT390 offers a number of significant advantages: First, it tests any outlet for both arc and ground fault integrity. Second, it tests at multiple trip levels so you can predict whether you just have a tired or non-exercised interruptor. Testing it side by side with a 350, the 390 was notably more consistent and accurate than the 350, in particular with regards to false negatives (the 390 identified arc faults in four times more installations than the 350. And lastly, the 390 is much more rugged in the case design, the cable connector, and the sturdiness of the internal circuit boards and components. What is missing in the 390? I'd love to see a set of clip leads so I could test an outlet box at the bare wires before installing the receptacle, And at nearly $200 a hard foam case would be appreciated. However, these are nits. This can be the most significant risk-prevention tool in your toolbox and should replace non-contact sniffers and the cheaper GFCI testers that we all carry around and rely on. Five stars from me.
Review: Great for checking receptacles for more than just correct wiring - I got the Klein RT390 mainly to look at voltage drop; I have one GFCI outlet and no GFCI or AFCI breakers. Given that, I probably didn’t stress the analyzer as much as some of the other reviewers did. I’m also not a practicing electrician, so I haven’t given the unit heavy use. My rating is based on using it only a few times, and it’s something I probably won’t be repeating on a daily basis—so I cannot really comment on reliability. The RT390 greatly simplifies measuring voltage drop by giving results at three different loads—12 A, 15 A, and 20 A—with the press of a button. The results are displayed for five minutes, even if the cable is disconnected, so it’s easy to take the analyzer to a computer to record the results; I put them into a spreadsheet that does some additional calculations, like estimating the length of the circuit under test. Detachable Cable The detachable cable is handy; anything with an IEC C13 connector can also be used. The 1’ cable supplied can be a bit short for some applications; I got 2′ and 3′ 14 AWG cables for some harder-to-reach locations; you probably could go a bit longer without serious problems. I also got a NEMA 5-15P to IEC C13 adapter (https://www.desertcart.com/dp/B0CT7HB42J) for direct plug in and an Ideal 61-183 SureTest® alligator clip adapter (https://www.desertcart.com/dp/B000R99RFI) for connections other than receptacles. A Sturdier Case It’s nice that Klein provide a case, but unlike most Fluke cases, the case isn’t padded and isn’t very protective—I would not want to drop it. The RT390 costs as much as many multimeters, so it’s worth protecting. To address this, I got a Jinmei EVA hard case (https://www.desertcart.com/dp/B0C24N9Z5W). Testing Ungrounded Devices As has been noted by some others, the analyzer will not perform any tests with “incorrect” wiring, so out of the box, it cannot be used on ungrounded receptacles or lamp sockets. But it’s simple to work around this if a good ground is available. I have a grounding wire that plugs into a grounded receptacle. I’ve used it to properly ground an antistatic mat; many of the better antistatic mats include such an adapter. I made mine from an old extension cord, but it could easily be made with green wire and a plug. I only extended the grounding conductor. I retained the neutral blade on the plug to keep the plug from spinning in the receptacle; I cut off the line blade and taped over it to minimize any chance of something unpleasant happening. If you make an adapter from scratch, connect only a green wire, and there should be no problem Finding the Source of a Voltage Drop As supplied, the RT390 is mainly intended for testing receptacles. If a test result shows an unacceptable voltage drop, the logical approach is to test points closer and closer to the supply. But if the available test points nearest the supply are light fixtures, switches, or junction boxes, plugging into a receptacle isn’t an option. Testing a Light Fixture The analyzer cable is inserted into a 3-wire to 2-wire plug adapter inserted into a socket adapter, and the grounding wire is connected to the grounding tab on the plug adapter. It’s a bit trickier if there aren’t any grounded receptacles handy, but a grounding wire can be connected to some other reasonable ground is available. I didn’t need to do this, so I can’t comment on what constitutes a “reasonable” ground. Do be aware that while a socket adapter (https://www.desertcart.com/dp/B0CDRFPD9G) accepts a 3-wire plug, it does not provide a protective ground because there is no ground in the socket to which it can connect. A Problem I’d Never Have Thought to Investigate Doing a test on a light fixture above a kitchen sink was revelatory. With my grounding hack connected, the RT390 happily … refused to do the test because the line and neutral were reversed. A check with a DMM confirmed that the socket threads were energized—and apparently have been for 70 years (I guess this stuff wasn’t taken too seriously in the era of 2-wire nonpolarized plugs). Arguably not the world’s worst safety hazard, but if one were to screw in a bulb with the socket energized and manage to touch the threads, it might not be fun. Especially if water had been splashed on the floor. After the fixture was correctly wired, the analyzer was glad to complete the test. I’d probably never have thought to test the fixture for correct wiring, though I’d have preferred the analyzer to apprise me of the reversed line and neutral at the same time it complained of the open ground. Testing a Switch or Other Connection Point If the neutral is accessible, connection can be made to switch terminals or splices, but it requires some improvised wiring. For a switch, you may need to disconnect the line from the switch terminal; for a splice, you’ll probably need to remove the wire nut (or the insulator or tape from a crimped ferrule). Connection to the RT390 can be made with something like the Ideal SureTest® alligator clip adapter. When connecting something like this to a switch or to light-fixture wiring, it’s imperative to take the utmost care to avoid a short circuit or even connections so close as to allow arcing. It’s possible to make an alligator-clip adapter; an internet search should find some examples. If doing so, you should be very careful, especially with alligator clips that aren’t fully insulated like those on the SureTest® adapter. It’s a risk I wasn’t willing to take. Testing Extension Cords A less obvious application is testing extension cords. On a whim, I checked a few and found that not all are created equal. In most cases, the drop is greater than would be predicted from the length and the wire size but not really a big deal. With several cords, however—interestingly, all from the same manufacturer—the voltage drop was astonishing. Suffice it to say those cords are unsuitable for all but the lightest loads. The procedure is simple: first, take a measurement with the RT390’s power cord connected to the receptacle; next, repeat the test with the extension cord between the receptacle and the power cord. Then subtract the voltage drop in the first test from that of the second to get the voltage drop of the extension cord. Results vary slightly from test to test, so it’s probably a good idea to do the tests several times and use the average results. When testing several extension cords, I usually repeat the test using the RT390’s power cord alone and use the average of these tests. A Low-Cost Alternative You can do a surprisingly good job with an inexpensive power meter (such as a P3 Kill A Watt; I have the P4400) and something like a hair dryer, but it can be a bit tedious, and there’s limited choice of loads. Unlike a Kill A Watt, though, the RT390 doesn’t show the actual current; I’m not sure the nominal loads are adjusted for voltage drop. I’m not sure it really matters, though. Results with the RT390 track pretty closely with those with the Kill A Watt and hair dryer. Since the hair dryer is a real load, this suggests that the RT390 is performing a good test. Conclusion There are other testers—like the Extech CT270 (https://www.desertcart.com/dp/B0058ELNFY)—that provide more information for a lot more money. And there are others that cost far more than that; some—like models from Ideal and Amprobe—appear to have been discontinued. For someone who’s not an electrician, even the RT390 is arguably massive overkill. Many simple testers will check for correct receptacle wiring; every home should have one. But it is nice to know if you have excessive voltage drop, especially in an older building. And especially if you strongly suspect that you have some marginal wiring. The RT390 makes that testing a breeze.

## Features

- CLEAR COLOR LCD DISPLAY: Circuit Analyzer with large color LCD provides easy-to-understand results for wiring faults, AFCI, GFCI, voltage drops, and device trip time
- COMPREHENSIVE WIRING FAULT DETECTION: Detect and identify common wiring faults in standard, AFCI, and GFCI electrical outlets, ensuring thorough evaluation
- DUAL WIRING FAULT DETECTION: Capable of detecting dual wiring faults, including open neutral and open ground, enhancing safety measures
- AFCI AND GFCI DEVICE INSPECTION: Inspect AFCI and GFCI devices, measuring trip time and trip current for accurate functionality assessment
- LOAD TESTING CAPABILITIES: Conduct 12A, 15A, and 20A load testing to measure percentage voltage drops, providing valuable insights into electrical performance
- AUTO POWER OFF: Automatically powers off after 5 minutes of inactivity, conserving battery life and ensuring long-term usage
- DETACHABLE CORD: Detachable cord allows for easy storage, providing convenience and organized handling of the Circuit Analyzer
- For use with North American 120V AC 3-wire electrical outlets
- Safety Rating: CAT III 135V

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0BT87LJRL |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #33,329 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #63 in Circuit Testers |
| Brand | KLEIN TOOLS |
| Color | Orange |
| Customer Reviews | 4.8 4.8 out of 5 stars (227) |
| Date First Available | January 27, 2023 |
| Finish | Brushed |
| Global Trade Identification Number | 00092644693632 |
| Included Components | 3 x AAA Batteries, Instructions, and Pouch |
| Item Package Quantity | 1 |
| Item Weight | 7.8 ounces |
| Item dimensions L x W x H | 7.07 x 2.72 x 1.51 inches |
| Item model number | RT390 |
| Manufacturer | Klein Tools |
| Material | Blend |
| Measurement Type | Voltmeter, Ammeter, Ohmmeter, Time-based |
| Min. Operating Voltage | 135 Volts (AC) |
| Part Number | RT390 |
| Pattern | Circuit Analyzer |
| Power Source | Battery Powered |
| Product Dimensions | 7.07 x 2.72 x 1.51 inches |
| Shape | Rectangular |
| Size | One Size |
| Specification Met | Cat Iii 135v, Afci, Gfci, Ul, Fcc |
| Style | Receptacle Tester w/Load Test |
| UPC | 092644693632 |
| Upper Temperature Rating | 55 Degrees Celsius |

## Product Details

- **Brand:** KLEIN TOOLS
- **Color:** Orange
- **Item Weight:** 0.49 Pounds
- **Power Source:** Battery Powered
- **Style:** Receptacle Tester w/Load Test

## Images

![RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time - Image 1](https://m.media-amazon.com/images/I/51n2Tv4OxkL.jpg)

## Questions & Answers

**Q: does this actually place a load on the circuit for for voltage drop?**
A: It simulates a 12,15, and 20 amp load and displays the percentage drop, according to the operating instructions.

**Q: Will this indicate open neutral or open ground when circuit is not energized?**
A: Way late on answer this.
If you’re talking about (Klein Tools RT210 Outlet Tester) then no, it has to have power on the circuit as this is not battery powered to show the tester how it’s wired.

**Q: Does this simulate and test both serial and parallel arc fault conditions?**
A: This tester plugs into an outlet on the circuit under test, so it seems to me that automatically makes it a parallel device. Therefore it can only simulate an arc fault such as might occur in a parallel device, i.e. what you normally plug into an outlet. (A typical faulty item being be a lamp with a frayed power cord.) I believe the tester would have to be wired into the circuit in series to simulate a serial arc fault. I don't know the nature of the tester's design but it may be that tripping an AFCI unit (an AFCI outlet, for instance) with a parallel fault simulation may also prove the AFCI's ability to respond to a serial arc fault, at least in part. Disclaimer: I'm not an electrician or EE so you may want to dig farther on this subject, but I believe I have the basics right.

**Q: Does this protect trip a gfci protected receptacle with an open ground?**
A: No it will not. No tester will trip a GFCI with open ground. You have to use the button on the receptacle/breaker in that case. Make sure the outlet is labeled with "no equipment ground."

## Customer Reviews

### ⭐⭐⭐⭐⭐ Standalone best wiring integrity tester!
*by M***T on January 6, 2026*

One has the option of a number of GFCI testers of which the Klein RT 310 and 350, the Fluke Pro 120+ are generally the best. But there's a new king in town. The RT390 is expensive and bulky, but it absolutely demands to be in the kit of any home inspector, safety inspector, electrician, or any homeowner who plans to do more than incidental work on their electrical systems. First, the arrival of AFCI's and especially hybrid AFCI/GFCI's has changed the outlet tester game. These breakers, Arc Fault Circuit Interruptors, detect arcs in the wiring and are most effective in identifying and protecting against electrical fires (GFCI's protect more directly against shocks emanating from the outlet and attached products). Most outlet testers don't test AFCI's. The Klein RT250 is a basic GFCI tester. Bump up to a RT310 and you get AFCI testing as well, but there's no diagnostic capability in the 310 -- it's a simple go/no-go tester that can't tell you anything about what's wrong. The RT350 does a bit more, but doesn't generate enough data for you to figure out what's wrong or how to fix it. I wouldn't generally recommend the 350 now that the 390 is available. The RT390 offers a number of significant advantages: First, it tests any outlet for both arc and ground fault integrity. Second, it tests at multiple trip levels so you can predict whether you just have a tired or non-exercised interruptor. Testing it side by side with a 350, the 390 was notably more consistent and accurate than the 350, in particular with regards to false negatives (the 390 identified arc faults in four times more installations than the 350. And lastly, the 390 is much more rugged in the case design, the cable connector, and the sturdiness of the internal circuit boards and components. What is missing in the 390? I'd love to see a set of clip leads so I could test an outlet box at the bare wires before installing the receptacle, And at nearly $200 a hard foam case would be appreciated. However, these are nits. This can be the most significant risk-prevention tool in your toolbox and should replace non-contact sniffers and the cheaper GFCI testers that we all carry around and rely on. Five stars from me.

### ⭐⭐⭐⭐⭐ Great for checking receptacles for more than just correct wiring
*by J***. on June 2, 2025*

I got the Klein RT390 mainly to look at voltage drop; I have one GFCI outlet and no GFCI or AFCI breakers. Given that, I probably didn’t stress the analyzer as much as some of the other reviewers did. I’m also not a practicing electrician, so I haven’t given the unit heavy use. My rating is based on using it only a few times, and it’s something I probably won’t be repeating on a daily basis—so I cannot really comment on reliability. The RT390 greatly simplifies measuring voltage drop by giving results at three different loads—12 A, 15 A, and 20 A—with the press of a button. The results are displayed for five minutes, even if the cable is disconnected, so it’s easy to take the analyzer to a computer to record the results; I put them into a spreadsheet that does some additional calculations, like estimating the length of the circuit under test. Detachable Cable The detachable cable is handy; anything with an IEC C13 connector can also be used. The 1’ cable supplied can be a bit short for some applications; I got 2′ and 3′ 14 AWG cables for some harder-to-reach locations; you probably could go a bit longer without serious problems. I also got a NEMA 5-15P to IEC C13 adapter (https://www.amazon.com/dp/B0CT7HB42J) for direct plug in and an Ideal 61-183 SureTest® alligator clip adapter (https://www.amazon.com/dp/B000R99RFI) for connections other than receptacles. A Sturdier Case It’s nice that Klein provide a case, but unlike most Fluke cases, the case isn’t padded and isn’t very protective—I would not want to drop it. The RT390 costs as much as many multimeters, so it’s worth protecting. To address this, I got a Jinmei EVA hard case (https://www.amazon.com/dp/B0C24N9Z5W). Testing Ungrounded Devices As has been noted by some others, the analyzer will not perform any tests with “incorrect” wiring, so out of the box, it cannot be used on ungrounded receptacles or lamp sockets. But it’s simple to work around this if a good ground is available. I have a grounding wire that plugs into a grounded receptacle. I’ve used it to properly ground an antistatic mat; many of the better antistatic mats include such an adapter. I made mine from an old extension cord, but it could easily be made with green wire and a plug. I only extended the grounding conductor. I retained the neutral blade on the plug to keep the plug from spinning in the receptacle; I cut off the line blade and taped over it to minimize any chance of something unpleasant happening. If you make an adapter from scratch, connect only a green wire, and there should be no problem Finding the Source of a Voltage Drop As supplied, the RT390 is mainly intended for testing receptacles. If a test result shows an unacceptable voltage drop, the logical approach is to test points closer and closer to the supply. But if the available test points nearest the supply are light fixtures, switches, or junction boxes, plugging into a receptacle isn’t an option. Testing a Light Fixture The analyzer cable is inserted into a 3-wire to 2-wire plug adapter inserted into a socket adapter, and the grounding wire is connected to the grounding tab on the plug adapter. It’s a bit trickier if there aren’t any grounded receptacles handy, but a grounding wire can be connected to some other reasonable ground is available. I didn’t need to do this, so I can’t comment on what constitutes a “reasonable” ground. Do be aware that while a socket adapter (https://www.amazon.com/dp/B0CDRFPD9G) accepts a 3-wire plug, it does not provide a protective ground because there is no ground in the socket to which it can connect. A Problem I’d Never Have Thought to Investigate Doing a test on a light fixture above a kitchen sink was revelatory. With my grounding hack connected, the RT390 happily … refused to do the test because the line and neutral were reversed. A check with a DMM confirmed that the socket threads were energized—and apparently have been for 70 years (I guess this stuff wasn’t taken too seriously in the era of 2-wire nonpolarized plugs). Arguably not the world’s worst safety hazard, but if one were to screw in a bulb with the socket energized and manage to touch the threads, it might not be fun. Especially if water had been splashed on the floor. After the fixture was correctly wired, the analyzer was glad to complete the test. I’d probably never have thought to test the fixture for correct wiring, though I’d have preferred the analyzer to apprise me of the reversed line and neutral at the same time it complained of the open ground. Testing a Switch or Other Connection Point If the neutral is accessible, connection can be made to switch terminals or splices, but it requires some improvised wiring. For a switch, you may need to disconnect the line from the switch terminal; for a splice, you’ll probably need to remove the wire nut (or the insulator or tape from a crimped ferrule). Connection to the RT390 can be made with something like the Ideal SureTest® alligator clip adapter. When connecting something like this to a switch or to light-fixture wiring, it’s imperative to take the utmost care to avoid a short circuit or even connections so close as to allow arcing. It’s possible to make an alligator-clip adapter; an internet search should find some examples. If doing so, you should be very careful, especially with alligator clips that aren’t fully insulated like those on the SureTest® adapter. It’s a risk I wasn’t willing to take. Testing Extension Cords A less obvious application is testing extension cords. On a whim, I checked a few and found that not all are created equal. In most cases, the drop is greater than would be predicted from the length and the wire size but not really a big deal. With several cords, however—interestingly, all from the same manufacturer—the voltage drop was astonishing. Suffice it to say those cords are unsuitable for all but the lightest loads. The procedure is simple: first, take a measurement with the RT390’s power cord connected to the receptacle; next, repeat the test with the extension cord between the receptacle and the power cord. Then subtract the voltage drop in the first test from that of the second to get the voltage drop of the extension cord. Results vary slightly from test to test, so it’s probably a good idea to do the tests several times and use the average results. When testing several extension cords, I usually repeat the test using the RT390’s power cord alone and use the average of these tests. A Low-Cost Alternative You can do a surprisingly good job with an inexpensive power meter (such as a P3 Kill A Watt; I have the P4400) and something like a hair dryer, but it can be a bit tedious, and there’s limited choice of loads. Unlike a Kill A Watt, though, the RT390 doesn’t show the actual current; I’m not sure the nominal loads are adjusted for voltage drop. I’m not sure it really matters, though. Results with the RT390 track pretty closely with those with the Kill A Watt and hair dryer. Since the hair dryer is a real load, this suggests that the RT390 is performing a good test. Conclusion There are other testers—like the Extech CT270 (https://www.amazon.com/dp/B0058ELNFY)—that provide more information for a lot more money. And there are others that cost far more than that; some—like models from Ideal and Amprobe—appear to have been discontinued. For someone who’s not an electrician, even the RT390 is arguably massive overkill. Many simple testers will check for correct receptacle wiring; every home should have one. But it is nice to know if you have excessive voltage drop, especially in an older building. And especially if you strongly suspect that you have some marginal wiring. The RT390 makes that testing a breeze.

### ⭐⭐⭐⭐⭐ Accurate load info.
*by H***O on January 1, 2026*

Great circuit analyzer. Very easy to use and accurate. This analyzer will save your house from a fire. Due to the load info.

## Frequently Bought Together

- Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time
- Klein Tools 69411 Circuit Breaker Finder Accessory Kit, Circuit Breaker Leads, Circuit Breaker Adapters

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.com.au/products/509901809-rt390-circuit-analyzer-with-large-lcd-identifies-wiring-faults-gfci](https://www.desertcart.com.au/products/509901809-rt390-circuit-analyzer-with-large-lcd-identifies-wiring-faults-gfci)

---

*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-01-22*