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Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

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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.
Is Discontinued By Manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 4.53 x 1.16 x 2 inches; 4.16 ounces
Item model number ‏ : ‎ RT250
Department ‏ : ‎ Unisex-Adult
Batteries ‏ : ‎ 2 AAAA batteries required. (included)
Date First Available ‏ : ‎ December 17, 2020
Manufacturer ‏ : ‎ Klein Tools
ASIN ‏ : ‎ B08QW7K1JJ
Best Sellers Rank: #1,657 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #3 in Voltage Testers
Customer Reviews: 4.8 4.8 out of 5 stars 10,904 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
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

13 reviews for Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

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  1. John

    Essential Tool for Electricians and DIY Pros
    As an electrician or serious DIY-er who cares about doing things right, this tester has quickly become one of my favorite go-to tools. The RT250 is packed with features and built to handle real-world job-site demands.What stands out:The large back-lit LCD display clearly shows voltage, wiring condition, and the time it takes a GFCI to trip—making testing thorough and faster.It automatically detects open neutral, open ground, and other common wiring faults—no more guesswork.The built-in GFCI test button trips the device and the timer measures how long it takes—great for verifying that the GFCI meets spec.Rugged build: rated for a 6.6-foot (2 m) drop and meets CAT II 135 V safety rating—solid for a busy job site.It’s compact and lightweight (just 4.8 oz) but feels tough—durable housing and robust plug make it practical for everyday use.My experience on the job:I’ve used this tester across new installs, upgrades, and troubleshooting older receptacles. It quickly flags incorrect wiring (open ground, reverse hot/neutral, etc.), and the extra info like voltage readout and trip time saves me from coming back later for retests. Switching between circuits is fast, the screen holds readings with Auto-Hold (perfect for hard-to-reach outlets), and the indicator LEDs still give quick visual cues when I want them.Final verdict:If you’re working with North American 3-wire 120 V outlets (especially ones with GFCI protection), this tester hits all the right notes: precision diagnostics, rugged build, and efficient troubleshooting. It’s built like a pro tool—and priced so that it’s worth having in your bag every day. I highly recommend it.

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  2. Amazon Customer

    Great product for price!
    I love this tester makes inspections much quicker and the added timer for the GFCI testing is a great added feature! It also holds the error for a few seconds so even in hard to see areas you’re able to diagnose without issue.

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  3. Jacque S.

    A must have and money well spent!
    Don’t guess when you can test! This tool is a must have for anyone doing residential electrical work. It gives you valuable information about connections and can save you not only money but also safety for your family. The nest $20.00 I ever spent on a tool!

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  4. Mr. DAD

    Works as it should and worth buying
    Works great, and a trusted brand! I just like having this and a multimeter available in my toolbox and bag, works for certain occasions.

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  5. Virtual1

    nice upgrade from the cheap trash testers
    I’ve owned several “outlet testers” over the years but they’ve mostly been trash. Now that I have an attic to finish I needed to get something actually useful. After looking around I settled on this one, which is a kind of a middle of the road tester. In addition to the usual “you wired it up wrong!” idiot lights, it’s got things like line voltage display. I can also plug it into an outlet that’s in a hard to reach place, then pull it out and look at it to see if it’s good. It’s also slightly larger than the cheap junk, just the right size to fit comfortably in the hand and plug/unplug.I’m happy to have this in my electrical tool box, everyone that works on outlets should have one

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  6. Tman

    Good
    Works well

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  7. J4M3R

    Good item.
    Works as advertised. Found some good outlets and some not so good wired outlets. Only wish is that it could be read with either ground lug below the power lugs, or with the newer standard, ground lug above the power lugs. With the new standard installation, the ground lug is up and the screen is facing down.

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  8. Stephen Johnston

    A little more expensive than the simple testers but worth it
    I have one of those 3 LED testers already, the ones with the 2 yellow and one red light… and has a legend on it so that you can tell what is what. Works great… only issue is that when I was working outdoors or in a brightly lit room, it wasn’t so obvious which LED were lit. So I bought the Klein as it wasn’t a bad price and had the built in GFCI too. My old set, I had a separate GFCI tester which also worked great but just meant I had 2 separate testers. I played with the Klein soon as I got it having installed the batteries (Klein supplied I might add!!!!). You need to hold the power button down a couple of seconds and then the LCD comes alive. I tried it in various outlets around the house and found it to be a really effective device. The unit has only 2 LED’s and there’s no mistaking when they light up, both bright… A green one which clearly means OK and a red one meaning a fault in the wiring has been detected. I already had a purpose made miswired test lead I used for verifying the fault detection capability. Works great. I also like that it provides a reading of the actual voltage detected. It’s not just a passive device.I have only one minor concern… When I put this in my toolbox I’m worried about something resting on the power switch and running the batteries down, so for now, having already carefully cut around the edge of the packaging, I’m keeping it in the packaged plastic. Might be overkill and maybe I’ll buy a protective case for it if I feel inclined but for now, perfectly happy with the device and definitely recommend over the typical passive receptacle testers, even though they may be half the price.

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  9. Chanel

    Amazing tool. Perfect for home-owners that are weary on the state of their outlets. Did a couple of outlet replacements and this unit came in handy to test and help identify faults. Even on GFCI outlets!

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  10. Enrique Ramirez Morales

    Buen producto muy util para probar los contactos.

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  11. Josue Adonay Vazquez Jimenez

    El paquete llego a tiempo. Funciona muy bien. Fácil uso después de leer el manual. Siempre recomendado para saber identificar las mensajes en la pantalla.

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  12. Friedrich

    Perfect great product I recommend

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  13. Zheythan Black

    Excelente, funciona Perfecto, marca recomendada. Todo súper.

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    Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles
    Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles

    $21.98

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