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⚡ Test Smarter, Work Safer — The Pro’s Choice for GFCI Confidence
The Klein Tools RT250 GFCI Outlet Tester is a professional-grade electrical tester designed for North American 3-wire 120V outlets. Featuring a large backlit LCD, it provides clear voltage readings, identifies common wiring faults including open neutral and ground, and measures GFCI trip times. With a CAT II 135V safety rating, auto-hold functionality, and bright LED indicators, it delivers reliable, precise diagnostics that empower electricians and managers to ensure safety and compliance on every job.


















| Asin | B08QW7K1JJ |
| Best Sellers Rank | #393,586 in Home Improvement (See Top 100 in Home Improvement) #588 in Multi Testers |
| Brand Name | KLEIN TOOLS |
| Colour | Multi |
| Customer Reviews | 4.8 4.8 out of 5 stars (11,016) 4.8 out of 5 stars |
| 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 Centimeters |
| 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 | 118 g |
| Item Width | 2 Inches |
| Manufacturer | Klein Tools |
| Maximum Operating Voltage | 120 Volts |
| Measurement Type | Voltage Tester |
| Minimum Operating Voltage | 120 Volts |
| Model Number | RT250 |
| Number Of Items | 1 |
| Part Number | RT250 |
| Power Source Type | Corded Electric |
| Specification Met | CSA |
| Style Name | Receptacle Tester |
| Unit Count | 1 Count |
| Upc | 092644693212 |
| Upper Temperature Rating | 60 Degrees Celsius |
User
Great Value
Good price, arrived on time. A must for all electrical installers.
User
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
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
Outlet tester
Good product
User
Buena compra
Muy fácil de utilizar, de gran utilidad para la lectura de tomas de corriente.
Trustpilot
1 week ago
5 days ago