--- product_id: 272328882 title: "Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles" brand: "klein tools" price: "$52.19" currency: USD in_stock: true reviews_count: 13 url: https://www.desertcart.ec/products/272328882-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric store_origin: EC region: Ecuador --- # Detects open neutral & ground wiring faults Backlit LCD for clear voltage & fault readout Precise GFCI trip time measurement Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles **Brand:** klein tools **Price:** $52.19 **Availability:** ✅ In Stock ## Summary > ⚡ Test Smarter, Work Safer — The Pro’s Choice for Electrical Confidence ## Quick Answers - **What is this?** Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles by klein tools - **How much does it cost?** $52.19 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/272328882-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric) ## Best For - klein tools enthusiasts ## Why This Product - Trusted klein tools brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Auto-Hold Convenience:** Secure readings on hard-to-reach outlets with an auto-hold feature that keeps data visible until you’re ready. - • **Crystal-Clear LCD Display:** Instantly read voltage and wiring status with a large backlit screen, even in dim spaces. - • **Next-Level Fault Detection:** Patent-pending tech spots open neutral and ground faults others miss, elevating your safety game. - • **Trusted Pro-Grade Durability:** Built by Klein Tools, a 160+ year legacy of precision and reliability trusted by professionals nationwide. - • **Lightning-Fast GFCI Trip Time:** Measure GFCI response times to ensure your outlets protect as they should—no guesswork. ## Overview 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. ## Description 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. ## Features - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | 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 | ## Product Details - **Brand:** KLEIN TOOLS - **Color:** Multi - **Item Weight:** 4.16 ounces - **Power Source:** Corded Electric - **Style:** Receptacle Tester ## Images ![Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles - Image 1](https://m.media-amazon.com/images/I/61HibJa1brL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: Is it ok to use this tester for the 20a power outlet (not gfci)?** A: A Very good question, since the device name starts with GFCI. Answer is YES, because despite the name, the device is mainly a regular outlet tester, checking cross wiring, missing wiring, and reporting voltages, all worthwhile tests for non-GFCI outlet. Also works with 15amp & 30amp with adapter. Thanks for the question. **Q: Most of the outlets in the basement where i'm living say >6.00 when i test them. are they wired wrong? is it safe to use the outlets?** A: It is not safe to use those outlets. If an outlet is good, the green light on the tester should illuminate, and the display should register a voltage close to 120 volts. **Q: Is this accurate enough to measure with some confidence which is the most upstream receptacle in a circuit for choosing gfci location?** A: Resolution accuracy inadequate for that task. Displayed digits determines resolution. In this case, meter accuracy will not be and can not be better than +/- 1 volt because digital resolution is always +/- 1 in the least significant digit. Example: If measuring a true, standardised 120 volts, meter might display 119V (-1), 120V or 121V (+1) if calibrated/adjusted correctly. You've got the right idea, but this meter displays only 2-1/2 digits (120V). You will need a meter with 3-1/2 (120.0V) digits displayed. Worst case resolution at 120 volts will then be ~0.1V (100 mV). You need to see those millivolts differences. Get one with stated accuracy and preferably calibrated. Cheers! **Q: What will happen if you press the gfci test on a non gfci? will it do nothing. or will it trip the breaker in the panel, and i have to flip the switch** A: The amber lights on the tester will blink, nothing will trip. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Simple and easy to use yet Amazing precision!!! *by on Reviewed in the United States December 31, 2025* 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! ### ⭐⭐⭐⭐⭐ Excellent tool for testing electrical outlets *by on Reviewed in the United States May 12, 2026* 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. ### ⭐⭐⭐⭐⭐ Easy to read and use for proper outlet installation *by on Reviewed in the United States June 3, 2026* 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. ## Frequently Bought Together - Klein Tools RT250 GFCI Outlet Tester with LCD Display, Electric Voltage Tester for Standard 3-Wire 120V Electrical Receptacles - Klein Tools 80016 Circuit Breaker Finder Tool Kit with Accessories, 2-Piece Set, Includes Cat. No. ET310 and Cat. No. 69411 - Klein Tools NCVT3P Dual Range Non Contact Voltage Tester, 12 - 1000V AC Pen, Flashlight, Audible and Flashing LED Alarms, Pocket Clip --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.ec/products/272328882-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric](https://www.desertcart.ec/products/272328882-klein-tools-rt250-gfci-outlet-tester-with-lcd-display-electric) --- *Product available on Desertcart Ecuador* *Store origin: EC* *Last updated: 2026-08-20*