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Internet #313832938

Model #RT250

Store SKU #1005530883

GFCI Receptacle Tester with LCD

  • GFCI electrical circuit tester inspects GFCI devices
  • Large LCD display shows voltage, wire faults, and GFCI trip time
  • Identifies common wiring faults on North American 120V outlets
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Product Overview

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.
  • GFCI Receptacle Tester features a large backlit LCD readout of voltage and clear indication of wiring conditions
  • LCD readout shows the time required to trip a GFCI device
  • Detect and identify common wiring faults
  • Patent pending detection of Open Neutral Open Ground wiring fault
  • Auto-Hold is convenient for hard-to-reach outlets
  • Bright green and red LEDs illuminate for visual indicators
  • CAT II 135V safety rating
  • Durable 6.6 ft. (2 m) drop protection
  • For use on 3-wire, North American 120V electrical outlets only
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  • California residents

Additional Resources

From the Manufacturer

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Control Type
Display Type
Electrical Tools Features
No Additional Features
Product Weight (lb.)
0.2600 lb
Test Meter Type
Specialty Meter/Tester
Tools Product Type
Test Meter

Warranty / Certifications

Manufacturer Warranty
Please refer to the attached warranty document in the Product Overview section above under Info & Guides

Questions & Answers

Typical questions asked about products:

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Customer Reviews

  • 4.8
    out of 522 reviews
  • 95%recommend this product
Filter by:
Showing 1-10 of 522 reviews
This is a game changer
I bought this a month ago. I use this on my side job work and I also use it at work. I just like how it helps make troubleshoot stuff.
    • Recommended
    Great meter with lots of features for the price
    After reading the reviews from others and looking at the price for features this meter has I went with the Klein CL800 for my A/C and electrical jobs. So far it works great and the accuracy is fine for field work.
    • Verified Purchase
    • Recommended
    Ok meter, hard to read screen and no tone with NCV
    Good feature set and feels good in the hand. I just hate how faded the screen gets at an angle or when I turn on the backlight. The last thing I want to do is have to stick my head in a box to view the screen or twist some wire. Also the NCV has no tone alarm, so strange. Normally I'm a big fan of Klein but I'm a pass on this tool. Fluke or Ideal clamp meters for me.
      quick & easy. [HD needs to increase review limit]
      voltage reading is my reason for getting this. a 2-3' extension makes perfect .. i added outlets & switches years ago & getting little shocks ,, but all is good finally with this tool . i suspect it was static carpet shocks. HD double write limit
        • Recommended
        This is a great tester with which you can test...
        This is a great tester with which you can test and diagnose variety of problems such as improper wiring, faulty grounds, timing for tripping of GFCI receptables and most importantly - voltage fluctuations. This is particularly helpful when you need to diagnose and service generators, flickering lights due to deteriorating connections on your main panel and so on. For the price, it is a must have in every service van and toolbelt and a very good addition to a home's repair kit.
        1 found this review helpful
        Awesome tester
        This is the best gfci tester I’ve seen. You can check voltages on a gfci receptacle or a regular one. It also tells you how fast the gfci trips
          • Recommended
          Good for voltage, amperage, etc., but not for temperature.
          Overall, the clamp meter is of good quality with acceptable results, when comparing it to the Klein MM700 multimeter. The discrepancy comes with using the thermocouple on the clamp meter. There was a sizable, erroneous difference when measuring ambient air temperature in a dwelling. My MM700 read 66.0F while the CL800 read 152.3. Upon switching my banana adapter and thermocouple from the MM700 to the CL800, the ambient temperature was only 0.7 degrees different than my multimeter. I contacted Klein Tools, informing them that I only wanted a new thermocouple and adapter. Unfortunately, they wanted the entire clamp meter with accessories back. Klein Tools, being a solid company, sent me a whole new CL800 clamp meter within 4 days. While there is some difference in temperature readings with the new CL800, I will use it more for voltage/amperage readings. As for the GFCI tester, I love it!
          • Verified Purchase
          • Recommended
          GFCI Testting Tool
          Perfect tool , easy to use
          • Verified Purchase
          • Recommended
          Excellent AC/DC True RMS Auto-Ranging Digital Clamp Meter .
          Excellent AC/DC True RMS Auto-Ranging Digital Clamp Meter with Temp Probe. Packed with Features Including Light.
            • Recommended
            This tester's model number is Klein RT250. It's a well design product with many features. Probabl...
            This tester's model number is Klein RT250. It's a well design product with many features. Probably the most important features are: 1) once inserted, it shows the voltage of the power outlet; 2) for GFCI outlet, it shows you if there are any wiring faults; 3) it has a green light and red light, from where you can easily tell if there are any issues or everything is alright. There are two free batteries that comes with the package. The only thing I don't like is that the plastic package is hard to open.
            • Recommended
            Showing 1-10 of 522 reviews