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October 21, 2021

Professional Tool Reviews for Pros


Klein Tools GFCI Receptacle Tester with LCD

Klein Tester Displays Wiring Problems on Helpful LCD Screen

The Klein GFCI Receptacle Tester detects common wiring problems, displays voltage, and inspects GFCIs. It’s small, handy, and with its LCD screen, convenient and simple to take a reading from quickly.


Klein on the GFCI Receptacle Tester

The RT250 was designed with unique features to make testing electrical outlets safer and easier. The RT250 features auto-hold, which keeps the reading on the screen so that users can remove the tester to view the display. This saves time and effort when working with receptacles in orientations with limited sightlines. An additional safety test includes the amount of time to trip a GFCI device, a feature not often found in GFCI testers at this price point.

Sabrina Kalsi, product manager at Klein Tools

What Stands Out?

The Klein GFCI Receptacle Tester takes testing 120V outlets to the next level of simplicity. It starts with the LCD readout. We don’t often see these on ground fault or socket testers. It shows the time required to trip a GFCI device and it detects and identifies common wiring faults. The tool even includes Klein’s patent-pending detection of Open Neutral/Open Ground wiring faults.

The auto-hold feature on the Klein RT250 seems really helpful, particularly for those of us with questionable eyesight or with backs that don’t like to spend a lot of time bent over.

For quick reference, Klein has included red and green LEDs that light up to indicate faults and correct wiring.


The Klein GFCI Receptacle Tester has a CAT II 135V safety rating for use on 3-wire, North American 120V electrical outlets. It also features drop protection that keeps it ticking even after taking a spill from up to 6.6 feet high.

Klein GFCI Receptacle Tester Pricing

The Klein GFCI Receptacle Tester is available from any number of retailers, both in-store and online. You can pick it up for $19.97, and it comes with a 2-year warranty. It looks like an easy-to-justify purchase and seems just as appropriate for homeowners as it does for Pros who want a quick testing tool in their bag.

Klein Tools GFCI Receptacle Tester Specs

  • Model: Klein RT250
  • Application: Detects and identifies common wiring problems in GFCI receptacles
  • Material: ABS and Electrical components
  • Drop Protection: 6.6 feet
  • AFCI: No
  • GFCI: Yes, including the time to trip device
  • Batteries: 2 x AAA
  • Included: 2 x 1.5V AAA alkaline batteries and manual
  • Standard: CAT II 135V Safety Rating
  • Length: 4.5 in.
  • Height: 1.1 in.
  • Width: 2 in.
  • Weight: 4.8 oz.
  • Warranty: 2 years
  • Price: $19.97

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