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

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.

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.

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.

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.

It is easy to understand and operated as should so far.

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.

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!

I was going to run a new GFCI outlet, and wanted to test the installed outlet voltage and trip time. This was able to do both easily, and was easy enough to use. Nice and easy numerical display readout, and LED lights.

Does exactly what the advertising says. Seems really well made from solid material.

Excelente herramienta para medir voltajes

Funciona perfecto y es muy práctico lo volvería a comprar

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.

This product is great! Backlit screen is very easy to read, the bright red and green indicators mean you know what’s happening even if you don’t have perfect line of sight to the screen, and the memory hood function means you can still see all the information after removing the device from the socket!! Not 100% sure on the accuracy of the meter but so far it seems to be pretty good!