---
product_id: 557085750
title: "Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red"
brand: "klein tools"
price: "38103 Ft"
currency: HUF
in_stock: true
reviews_count: 5
category: "Klein Tools"
url: https://www.desertcart.hu/products/557085750-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric
store_origin: HU
region: Hungary
---

# Backlit LCD voltage & fault display GFCI trip time measurement CAT II 135V safety rating Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red

**Brand:** klein tools
**Price:** 38103 Ft
**Availability:** ✅ In Stock

## Summary

> ⚡ Test Like a Pro, Stay Shock-Free!

## Quick Answers

- **What is this?** Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red by klein tools
- **How much does it cost?** 38103 Ft with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hu](https://www.desertcart.hu/products/557085750-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

- • **Visual Fault Alerts:** Bright green/red LEDs provide immediate, unmistakable wiring condition feedback for quick diagnostics.
- • **Hands-Free Convenience:** Auto-Hold feature locks readings for those hard-to-reach outlets—test smarter, not harder.
- • **Precision GFCI Trip Timing:** See exact trip time on-screen to troubleshoot GFCI devices with unmatched accuracy and speed.
- • **Next-Level Safety Detection:** Patent-pending tech spots open neutral and ground faults others miss, elevating your electrical safety game.
- • **Instant Voltage & Fault Clarity:** Large backlit LCD delivers crystal-clear voltage readings and wiring fault identification at a glance.

## Overview

The Klein Tools RT250 is a professional-grade GFCI outlet tester designed for North American 3-wire 120V receptacles. Featuring a large backlit LCD, it provides clear voltage readings, identifies common wiring faults including open neutral and ground, and displays GFCI trip times. With a CAT II 135V safety rating, auto-hold functionality, and bright LED indicators, it ensures fast, accurate, and safe electrical testing for electricians and serious 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: My old outlet tester failed after a number of years. (Different brand) after tracing and checking neutrals right back to the panel I purchased this tester and realized I spent a couple hours when everything was OK.
Review: Excelente, funciona Perfecto, marca recomendada. Todo súper.

## 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 |
| Are batteries included? | Yes |
| Batteries | 2 AAAA batteries required. (included) |
| Best Sellers Rank | #306,274 in Home Improvement ( See Top 100 in Home Improvement ) #451 in Multi Testers |
| Brand | KLEIN TOOLS |
| Colour | Multi |
| Customer Reviews | 4.8 4.8 out of 5 stars (10,734) |
| Date First Available | 25 July 2023 |
| Generic Name | Klein Tools RT250 GFCI Receptacle Tester with LCD Display, for Standard 3-Wire 120V Electrical Outlets |
| Global Trade Identification Number | 00092644693212 |
| Included Components | 2 x 1.5V AAA Alkaline Batteries and Manual |
| Item Dimensions LxWxH | 11.5 x 2.9 x 5.1 Centimeters |
| Item Height | 2 Inches |
| Item Weight | 118 g |
| Item Width | 1.16 Inches |
| Item dimensions L x W x H | 11.5 x 2.9 x 5.1 Centimeters |
| Item model number | RT250 |
| Manufacturer | Klein Tools |
| Maximum Operating Voltage | 120 Volts |
| Measurement Type | Voltage Tester |
| Min. Operating Voltage | 120 Volts |
| Model number | RT250 |
| Net Quantity | 1 Count |
| Number of Memory Sticks | 1 |
| Power Source | Corded Electric |
| Product Dimensions | 11.51 x 2.95 x 5.08 cm; 117.93 g |
| Special Feature | Large LCD Display; Patent Pending Detection of Open Neutral Open Ground Wiring Fault; Shows Amount of Time it Takes to Trip GFCI |
| Specification Met | CSA |
| Style | Receptacle Tester |
| UPC | 092644693212 |
| Upper Temperature Rating | 60 Degrees Celsius |

## Product Details

- **Brand:** KLEIN TOOLS
- **Colour:** Multi
- **Item Weight:** 118 g
- **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,Green/Red - Image 1](https://m.media-amazon.com/images/I/61HibJa1brL.jpg)
![Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red - Image 2](https://m.media-amazon.com/images/I/61hoVAaxUJL.jpg)
![Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red - Image 3](https://m.media-amazon.com/images/I/611ymTS69VL.jpg)
![Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red - Image 4](https://m.media-amazon.com/images/I/61zJGdbZbmL.jpg)
![Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles,Green/Red - Image 5](https://m.media-amazon.com/images/I/71NLG926GQL.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

### ⭐⭐⭐⭐⭐ Review
*by S***N on 13 January 2026*

My old outlet tester failed after a number of years. (Different brand) after tracing and checking neutrals right back to the panel I purchased this tester and realized I spent a couple hours when everything was OK.

### ⭐⭐⭐⭐⭐ Review
*by Z***K on 21 March 2025*

Excelente, funciona Perfecto, marca recomendada. Todo súper.

### ⭐⭐⭐⭐⭐ Review
*by D***N on 31 December 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!

## Frequently Bought Together

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*Product available on Desertcart Hungary*
*Store origin: HU*
*Last updated: 2026-02-26*