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jk6812 | Staff 5.2K Views
Sep 18, 2026 3:47 AM

Klein Tools RT250 GFCI Outlet Tester w/ LCD Display $17.38 + Free Shipping w/ Prime or on $35+

$17

$25

32% off
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Deal Details
Onkata via Amazon [amazon.com] has Klein Tools RT250 GFCI Outlet Tester w/ LCD Display on sale for $17.38. Shipping is free w/ Prime or on orders $35+.

From Merchant's Product Page:
  • Features:
    • Large backlit LCD readout for voltage reading and wiring condition indication
    • Trip time display shows time required to trip a GFCI device
    • Detects and identifies common wiring faults in GFCI receptacles
    • Patent-pending Open Neutral and Open Ground fault detection
    • Auto-Hold function retains reading for hard-to-reach outlets
    • Compatible with standard 3-wire 120V electrical receptacles
    • CSA certified
  • Specs:
    • Model: RT250
    • Operating voltage: 120V AC
    • Upper temperature rating: 60°C
    • Dimensions: 4.53" x 1.16" x 2"
    • Weight: 4.16 oz
  • Includes:
    • RT250 GFCI outlet tester
    • 2x 1.5V AAA alkaline batteries
    • Manual

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Deal Details
Community Notes
About the Poster
Onkata via Amazon [amazon.com] has Klein Tools RT250 GFCI Outlet Tester w/ LCD Display on sale for $17.38. Shipping is free w/ Prime or on orders $35+.

From Merchant's Product Page:
  • Features:
    • Large backlit LCD readout for voltage reading and wiring condition indication
    • Trip time display shows time required to trip a GFCI device
    • Detects and identifies common wiring faults in GFCI receptacles
    • Patent-pending Open Neutral and Open Ground fault detection
    • Auto-Hold function retains reading for hard-to-reach outlets
    • Compatible with standard 3-wire 120V electrical receptacles
    • CSA certified
  • Specs:
    • Model: RT250
    • Operating voltage: 120V AC
    • Upper temperature rating: 60°C
    • Dimensions: 4.53" x 1.16" x 2"
    • Weight: 4.16 oz
  • Includes:
    • RT250 GFCI outlet tester
    • 2x 1.5V AAA alkaline batteries
    • Manual

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7 Comments

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Sep 18, 2026 3:00 PM
180 Comments
Joined Feb 2006
Heywood JablomiSep 18, 2026 3:00 PM
180 Comments
You really don't want a device like this to require batteries unless you're a pro who uses it every day.
1
Sep 19, 2026 12:02 AM
90 Comments
Joined Mar 2009
BmopSep 19, 2026 12:02 AM
90 Comments
Quote from Heywood Jablomi View quoted comment :
You really don't want a device like this to require batteries unless you're a pro who uses it every day.
This is normally priced $20 and is worth it for a homeowner who wants to test their outlets for correct wiring as well as voltage and gfci trip time. At this price it's only $7 more than most 3 light versions.
Sep 19, 2026 12:12 AM
825 Comments
Joined Mar 2014
RaphySep 19, 2026 12:12 AM
825 Comments
Why not just use a 3 light tester and push the buttons yourself to test the GFCI?
Pro
Sep 19, 2026 12:23 AM
3.5K Comments
Joined Sep 2016
vid1900
Pro
Sep 19, 2026 12:23 AM
3.5K Comments

Our community has rated this post as helpful. If you agree, why not thank

This will tell you if you have over-voltage, stolen neutral, under voltage, a ton of stuff that a 3 light tester won't tell you.

The GFCI own button will always trip, even if it's defective. That's why the building inspector always uses his own tester.
2
Sep 23, 2026 7:32 PM
260 Comments
Joined Oct 2015
mrtechiemanSep 23, 2026 7:32 PM
260 Comments
Grabbed this and the Klein multimeter in the same day. Used the other link and bought it directly from Amazon.
Last edited by mrtechieman September 24, 2026 at 01:00 PM.
Pro
Sep 24, 2026 12:40 PM
2.4K Comments
Joined May 2010
artcab
Pro
Sep 24, 2026 12:40 PM
2.4K Comments
1
Pro
Sep 26, 2026 12:07 AM
2.4K Comments
Joined May 2010
artcab
Pro
Sep 26, 2026 12:07 AM
2.4K Comments
Quote from Raphy View quoted comment :
Why not just use a 3 light tester and push the buttons yourself to test the GFCI?
This tester will test if outlets downstream of a GFCI are protected by that GFCI - plug this in to a downstream outlet, press the GFCI test button on the tester, and if the GFCI upstream trips, you know the outlet you're testing is GFCI protected. This tester will aso report the GFCI response time in milliseconds i believe.

A typical test scenario would be kitchen counter outlets near a water source (sink) - generally a GFCI will protect one or more downstrean outlets, so this tester could be used to confirm that the downstream outlet (or outlets) are protected by the upstram GFCI.

Pressing the test button on the GFCI itself will indeed test that GFCI, but if downstream outels from that GFCI are supposed to be GFCI protected, this tester will confirm the GFCI protection downstream - it is possible that downstream outlets were miswired from the line side of the GFCI rather than the load side of the GFCI, in which case the GFCI won't trip when testing a downstrream outlet, requiring further investigation.

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