⚡ 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 a CAT II 135V safety rating and convenient auto-hold function, it delivers reliable, safe, and efficient electrical testing trusted by professionals since 1857.
| ASIN | B08QW7K1JJ |
| Best Sellers Rank | 770,086 in DIY & Tools ( See Top 100 in DIY & Tools ) 868 in Circuit Testers |
| Brand | KLEIN TOOLS |
| Colour | Multi |
| Customer Reviews | 4.8 out of 5 stars 11,175 Reviews |
| Global Trade Identification Number | 00092644693212 |
| Included Components | 2 x 1.5V AAA Alkaline Batteries and Manual |
| Item Dimensions | 11.5 x 2.9 x 5.1 centimetres |
| Item Length | 4.5 Inches |
| Item Type Name | Klein Tools RT250 GFCI Receptacle Tester with LCD Display, for Standard 3-Wire 120V Electrical Outlets |
| Item Weight | 0.26 Pounds |
| Item Width | 2 Inches |
| Item dimensions L x W x H | 11.5 x 2.9 x 5.1 centimetres |
| Item weight | 0.26 Pounds |
| Manufacturer | Klein Tools |
| Manufacturer Part Number | RT250 |
| Maximum Operating Voltage | 120 Volts |
| Measurement Type | Voltmeter |
| Minimum Operating Voltage | 120 Volts (AC) |
| Model Number | RT250 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Corded Electric |
| Power source | Corded Electric |
| Specification Met | CSA |
| Style | Receptacle Tester |
| Style Name | Receptacle Tester |
| UPC | 092644693212 |
| Unit Count | 1 1 |
| Upper Temperature Rating | 60 Degrees Celsius |
M**K
Outlet tester
Good product
J**N
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.
B**.
Muy buen producto
Buen producto, me llegó antes de la fecha programada, empaquetado y sellado. Usa 2 pilas AAA de 1.5 V. Ya viene con sus pilas. Se necesita un pequeño desarmador de cruz (la tapa usa un tornillo más pequeño de lo habitual) para insertar las pilas yo utilice uno del #1 y me funcionó perfectamente. Ya trae su instructivo en inglés español y francés.
J**M
Great Value
Good price, arrived on time. A must for all electrical installers.
C**A
Bueno! No apto para sistemas 220v
El producto es de alta calidad y funciona a la perfección, solo que me falto leeer que no soporta voltajes mayores a 135v AC asi que no puedo testear sistemas a 220v
Trustpilot
3 weeks ago
3 weeks ago