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⚡ Test Smarter, Work Safer — The Pro’s Choice for Electrical Confidence
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 measures GFCI trip times for precise troubleshooting. With an auto-hold function and rugged build, it’s engineered to meet the demands of electricians and managers who prioritize safety, accuracy, and efficiency on every job.
| Asin | B08QW7K1JJ |
| Best Sellers Rank | #893 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #3 in Voltage Testers |
| Brand Name | KLEIN TOOLS |
| Color | Multi |
| Customer Reviews | 4.8 4.8 out of 5 stars (11,406) 4.8 out of 5 stars |
| Global Trade Identification Number | 00092644693212 |
| Included Components | 2 x 1.5V AAA Alkaline Batteries and Manual |
| Item Dimensions | 4.53 x 1.16 x 2 inches |
| Item Type Name | Klein Tools RT250 GFCI Receptacle Tester with LCD Display, for Standard 3-Wire 120V Electrical Outlets |
| Item Weight | 4.16 ounces |
| Manufacturer | Klein Tools |
| Maximum Operating Voltage | 120 volts |
| Measurement Type | Voltmeter |
| Minimum Operating Voltage | 120 volts_of_alternating_current |
| Model | RT250 |
| Number Of Items | 1 |
| Part Number | RT250 |
| Power Source | Corded Electric |
| Specification Met | CSA |
| Style Name | Receptacle Tester |
| Unit Count | 1 Count |
| Upc | 092644693212 |
| Upper Temperature Rating | 60 °C |
| Warranty Description | See Manufacturer Website |
User
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!
User
Excellent tool for testing electrical outlets
This tool makes testing electrical outlets quick and easy. It is especially helpful to locate GFI outlets that are chained together. The tester can purposely trip the GFI and you can locate the downstream outlets that do not have power. The only drawback is it can be difficult to remove it from some outlets.
User
Easy to read and use for proper outlet installation
An excellent product that takes the guess work out of electrical outlet installation. The display is easy to read and lets you know definitively if you are wired correctly or not. The red and green lights are nice as well as the LED voltage readout. Very accurate and a good value. Also great for checking GFI circuits.
User
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.
User
Nice with the digital readout
Nice to have the readout - works well for normal and GFI
User
This item works well and gives you a good reading on a possible problem.
This is a great tool for testing a GFCI if you are having problems with one in your home. I found out that mine was bad using this tester.
User
Quick, Clear, and Useful for Service Work
This outlet tester is easy to use and gives a quick, clear reading without any guesswork. The LCD display is a big improvement over basic light-only testers because it shows the voltage and makes wiring problems easier to identify. The GFCI test button works well, and the tool feels solid enough for regular use in the field. It is a dependable tester that earns a place in the tool bag.
User
good item
good item
User
Calidad
Calidad y exactitud
User
Definitely recommend this tool.
Does exactly what the advertising says. Seems really well made from solid material.
User
Handy Tool
This tester could save your life. Used in an RV with no issues - the tester showed all was well. Using the same tester in a house, it gave an indication of potential wiring issue, as the voltage showed 30VAC on first check and 123V on a subsequent check. It will also indicate ground issue, reverse polarity. Glad to have bought.
User
Buen probador
Excelente herramienta para medir voltajes
User
Funcional
Funciona perfecto y es muy práctico lo volvería a comprar
Trustpilot
1 month ago
1 week ago