---
product_id: 562206413
title: "Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange"
brand: "klein tools"
price: "R$5818"
currency: BRL
in_stock: true
url: https://www.desertcart.com.br/products/562206413-klein-tools-rt390-circuit-analyzer-with-large-lcd-identifies-wiring
store_origin: BR
region: Brazil
---

# Detects wiring faults & voltage drops Large color LCD for clear results Measures AFCI/GFCI trip time Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange

**Brand:** klein tools
**Price:** R$5818
**Availability:** ✅ In Stock

## Summary

> ⚡ Power Up Your Precision – Test Smarter, Work Safer!

## Quick Answers

- **What is this?** Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange by klein tools
- **How much does it cost?** R$5818 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/562206413-klein-tools-rt390-circuit-analyzer-with-large-lcd-identifies-wiring)

## 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

- • **Load Testing at Multiple Amps:** Test voltage drops at 12A, 15A, and 20A loads to guarantee optimal circuit performance.
- • **Precision AFCI & GFCI Testing:** Accurately measure trip time and current to ensure your safety devices perform flawlessly.
- • **Instant Clarity with Color LCD:** See wiring faults and voltage drops in vivid detail for faster, confident diagnostics.
- • **Smart Power Management & Portability:** Auto shut-off saves battery life; detachable cord keeps your toolkit sleek and organized.
- • **Dual Fault Detection for Ultimate Safety:** Identify open neutral and ground faults to prevent costly electrical hazards.

## Overview

The Klein Tools RT390 Circuit Analyzer is a professional-grade tester designed for North American 120V AC outlets. Featuring a large color LCD, it detects wiring faults including dual faults, inspects AFCI and GFCI devices with trip time measurement, and performs load testing at 12A, 15A, and 20A. Lightweight and battery-powered with auto shut-off and a detachable cord, it delivers reliable, easy-to-interpret diagnostics for electricians and serious DIYers alike.

## Description

Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | KLEIN TOOLS |
| Power Source | Battery Powered |
| Item Weight | 222 g |
| Item dimensions L x W x H | 25.4 x 25.4 x 25.4 Centimeters |
| Min. Operating Voltage | 120 Volts |
| Specification Met | Cat Iii 135v, Afci, Gfci, Ul, Fcc |
| Upper Temperature Rating | 55 Degrees Celsius |
| Measurement Type | Analog Tester |
| Maximum Operating Voltage | 120 Volts |
| UPC | 092644693632 |
| Manufacturer | Klein Tools |
| Global Trade Identification Number | 00092644693632 |
| Country of Origin | China |
| Item model number | RT390 |
| Product Dimensions | 25.4 x 25.4 x 25.4 cm; 222.26 g |
| ASIN | B0BT87LJRL |

## Product Details

- **Brand:** KLEIN TOOLS
- **Power Source:** Battery Powered
- **Item Weight:** 222 g
- **Item dimensions L x W x H:** 25.4 x 25.4 x 25.4 Centimeters
- **Min. Operating Voltage:** 120 Volts

## Images

![Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange - Image 1](https://m.media-amazon.com/images/I/51n2Tv4OxkL.jpg)
![Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange - Image 2](https://m.media-amazon.com/images/I/61dL1IUkdTL.jpg)
![Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange - Image 3](https://m.media-amazon.com/images/I/614yoSvuN-L.jpg)
![Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange - Image 4](https://m.media-amazon.com/images/I/71FxkqNd7pL.jpg)
![Klein Tools RT390 Circuit Analyzer with Large LCD, Identifies Wiring Faults, GFCI and AFCI Tester, Voltage Drop, Displays Trip Time,Orange - Image 5](https://m.media-amazon.com/images/I/61UorKMK6zL.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."

## Frequently Bought Together

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-03-02*