---
product_id: 272328882
title: "Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles"
brand: "klein tools"
price: "€ 53.09"
currency: EUR
in_stock: true
reviews_count: 13
category: "Klein Tools"
url: https://www.desertcart.fi/products/272328882-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric
store_origin: FI
region: Finland
---

# Clear LCD readout Precise GFCI trip time Bright LED wiring indicators Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

**Brand:** klein tools
**Price:** € 53.09
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your safety game with precision you can see!

## Quick Answers

- **What is this?** Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles by klein tools
- **How much does it cost?** € 53.09 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/272328882-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric)

## 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

- • **Hands-Free Convenience:** Auto-Hold feature locks readings for those hard-to-reach outlets, making your workflow smoother and faster.
- • **Pro-Grade GFCI Testing:** Trip time display lets you troubleshoot GFCI devices with pinpoint accuracy—essential for any serious electrical check.
- • **Instant Voltage Clarity:** Large backlit LCD delivers quick, easy-to-read voltage and wiring status—no guesswork, just confidence.
- • **Next-Level Safety Detection:** Patent-pending Open Neutral & Open Ground detection catches hidden wiring faults before they become hazards.
- • **Trusted Durability & Safety:** CAT II 135V rating ensures reliable, professional-grade testing built to last through every job.

## Overview

The Klein Tools RT250 GFCI Outlet Tester is a professional-grade electrical tester designed for North American 3-wire 120V outlets. Featuring a large backlit LCD, it provides clear voltage readings, identifies common wiring faults including open neutral and ground, and measures GFCI trip times for accurate troubleshooting. With bright LED indicators, an auto-hold function, and a CAT II 135V safety rating, this compact, durable tool delivers fast, reliable diagnostics trusted by professionals and DIYers alike.

## Description

The RT250 is an electrical receptacle tester that tests the wiring conditions at an electrical outlet and inspects GFCI devices. The LCD displays the voltage, identifies the wiring fault, and the time required to trip a GFCI device. It is designated for use with North American 3-wire 120V 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: Simple and easy to use yet Amazing precision!!! - I picked up the Klein Tools RT250 GFCI Outlet Tester to help check a few outlets around my house, and I’m honestly impressed. This thing is super straightforward, just plug it in, the lights pop on, and you instantly know what’s going on with the wiring. No guesswork, no complicated setup, just clear results. The display is bright and easy to read, and the built-in GFCI test button is a lifesaver when checking bathroom and kitchen outlets. It helped me identify a miswired outlet in an older part of my house that I never would’ve caught otherwise. For something at this price, it feels durable and professional like something an electrician would actually use. If you’re a homeowner, DIYer, or just want peace of mind about the electrical safety in your place, this is a solid buy. Fast, accurate, and super easy to use. Highly recommend!
Review: Very nice electrical tester - Great addition to my electrical tools. This tester has a nice LCD screen that shows voltage, wiring status (correct or not correct) and GFCI test results. Very useful information

## Features

- CLEAR LCD READOUT: GFCI Receptacle Tester features a large backlit LCD readout for easy voltage reading and clear indication of wiring conditions
- TRIP TIME DISPLAY: LCD readout shows the time required to trip a GFCI device, allowing for quick and accurate troubleshooting
- DETECT COMMON WIRING FAULTS: Detect and identify common wiring faults, ensuring electrical safety and proper functionality of GFCI receptacles
- PATENT-PENDING OPEN NEUTRAL & OPEN GROUND DETECTION: Innovative detection system identifies Open Neutral and Open Ground wiring faults, enhancing safety measures
- CONVENIENT AUTO-HOLD FEATURE: Auto-Hold function holds the reading for hard-to-reach outlets, providing convenience and ease of use
- VISIBLE LED INDICATORS: Bright green and red LEDs illuminate to provide clear visual indicators of wiring conditions, making it easy to identify issues
- CAT II 135V SAFETY RATING: GFCI Receptacle Tester has a CAT II 135V safety rating, ensuring reliable and safe electrical testing for various applications

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08QW7K1JJ |
| Batteries | 2 AAAA batteries required. (included) |
| Best Sellers Rank | #1,412 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #3 in Voltage Testers |
| Brand | KLEIN TOOLS |
| Color | Multi |
| Date First Available | December 17, 2020 |
| Department | Unisex-Adult |
| Global Trade Identification Number | 00092644693212 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 4.2 ounces |
| Item dimensions L x W x H | 4.53 x 1.16 x 2 inches |
| Item model number | RT250 |
| Manufacturer | Klein Tools |
| Maximum Operating Voltage | 120 Volts |
| Measurement Type | Voltmeter |
| Min. Operating Voltage | 120 Volts (AC) |
| Power Source | Corded Electric |
| Product Dimensions | 4.53 x 1.16 x 2 inches |
| Specification Met | CSA |
| Style | Receptacle Tester |
| UPC | 092644693212 |
| Upper Temperature Rating | 60 Degrees Celsius |

## Product Details

- **Brand:** KLEIN TOOLS
- **Color:** Multi
- **Item Weight:** 4.16 ounces
- **Power Source:** Corded Electric
- **Style:** Receptacle Tester

## Images

![Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles - Image 1](https://m.media-amazon.com/images/I/61HibJa1brL.jpg)

## Available Options

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

## Questions & Answers

**Q: Is it ok to use this tester for the 20a power outlet (not gfci)?**
A: A Very good question, since the device name starts  with GFCI.  Answer is YES, because despite the name, the device is mainly a regular outlet tester, checking cross wiring, missing wiring, and reporting voltages, all worthwhile tests for non-GFCI outlet.  Also works with 15amp & 30amp with adapter.  Thanks for the question.

**Q: Most of the outlets in the basement where i'm living say >6.00 when i test them. are they wired wrong? is it safe to use the outlets?**
A: It is not safe to use those outlets. If an outlet is good, the green light on the tester should illuminate, and the display should register a voltage close to 120 volts.

**Q: Is this accurate enough to measure with some confidence which is the most upstream receptacle in a circuit for choosing gfci location?**
A: Resolution accuracy inadequate for that task. Displayed digits determines resolution. In this case, meter accuracy will not be and can not be better than +/- 1 volt because digital resolution is always +/- 1 in the least significant digit.
Example: If measuring a true, standardised 120 volts, meter might display 119V (-1), 120V or 121V (+1) if calibrated/adjusted correctly.
You've got the right idea, but this meter displays only 2-1/2 digits (120V). You will need a meter with 3-1/2 (120.0V) digits displayed. Worst case resolution at 120 volts will then be ~0.1V (100 mV). You need to see those millivolts differences. Get one with stated accuracy and preferably calibrated. Cheers!

**Q: What will happen if you press the gfci test on a non gfci? will it do nothing. or will it trip the breaker in the panel, and i have to flip the switch**
A: The amber lights on the tester will blink, nothing will trip.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Simple and easy to use yet Amazing precision!!!
*by D***N on December 31, 2025*

I picked up the Klein Tools RT250 GFCI Outlet Tester to help check a few outlets around my house, and I’m honestly impressed. This thing is super straightforward, just plug it in, the lights pop on, and you instantly know what’s going on with the wiring. No guesswork, no complicated setup, just clear results. The display is bright and easy to read, and the built-in GFCI test button is a lifesaver when checking bathroom and kitchen outlets. It helped me identify a miswired outlet in an older part of my house that I never would’ve caught otherwise. For something at this price, it feels durable and professional like something an electrician would actually use. If you’re a homeowner, DIYer, or just want peace of mind about the electrical safety in your place, this is a solid buy. Fast, accurate, and super easy to use. Highly recommend!

### ⭐⭐⭐⭐⭐ Very nice electrical tester
*by K***M on January 28, 2026*

Great addition to my electrical tools. This tester has a nice LCD screen that shows voltage, wiring status (correct or not correct) and GFCI test results. Very useful information

### ⭐⭐⭐⭐⭐ Easy to use. Good quality
*by B***E on March 8, 2026*

Super easy to use. Easy to read digital display. Worked perfectly when I had to label my circuit breaker panel.

## Frequently Bought Together

- Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles
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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-17*