Item 1 of 4
Item 1 of 4
frontpageRokket | Staff posted Aug 3, 2026 3:50 AM
Klein Tools GFCI Receptacle Outlet Tester w/ LCD
$20
$25
20% off
Amazon
AmazonDeal Details
Amazon has Klein Tools GFCI Outlet Receptacle Tester w/ LCD (RT250) on sale for $19.88. Shipping is free w/ Prime or on $35+ orders
Lowe's also has Klein Tools GFCI Outlet Receptacle Tester w/ LCD (RT250) on sale for $19.98. Shipping is free for My Lowe's Rewards Members (free to join), otherwise select free store pickup where available.
Details:
Lowe's also has Klein Tools GFCI Outlet Receptacle Tester w/ LCD (RT250) on sale for $19.98. Shipping is free for My Lowe's Rewards Members (free to join), otherwise select free store pickup where available.
- Note: Availability for pickup may vary by location.
Details:
- GFCI receptacle tester with large backlit LCD readout for voltage and wiring conditions
- Displays trip time for GFCI devices
- Detects and identifies common wiring faults
- Patent-pending Open Neutral and Open Ground detection
- Auto-Hold feature for hard-to-reach outlets
- Uses 2 x 1.5V AAA batteries (included)
Editor's Notes
Written by citan359 | Staff- This price matches our recent Frontpage Deal.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Amazon has Klein Tools GFCI Outlet Receptacle Tester w/ LCD (RT250) on sale for $19.88. Shipping is free w/ Prime or on $35+ orders
Lowe's also has Klein Tools GFCI Outlet Receptacle Tester w/ LCD (RT250) on sale for $19.98. Shipping is free for My Lowe's Rewards Members (free to join), otherwise select free store pickup where available.
Details:
Lowe's also has Klein Tools GFCI Outlet Receptacle Tester w/ LCD (RT250) on sale for $19.98. Shipping is free for My Lowe's Rewards Members (free to join), otherwise select free store pickup where available.
- Note: Availability for pickup may vary by location.
Details:
- GFCI receptacle tester with large backlit LCD readout for voltage and wiring conditions
- Displays trip time for GFCI devices
- Detects and identifies common wiring faults
- Patent-pending Open Neutral and Open Ground detection
- Auto-Hold feature for hard-to-reach outlets
- Uses 2 x 1.5V AAA batteries (included)
Editor's Notes
Written by citan359 | Staff- This price matches our recent Frontpage Deal.
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
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Top Comments
The screen is to give you the GFCI trip time (older/defective GFCI will often still trip, but take too many milliseconds to do so). After 15 or so years, they may trip with the self-test button, but not with an external tester. That is why the home inspector will flag certain GFCI, even though they appear to 'work'.
The other reason the LCD is useful, is that it will read the voltage at the outlet. This only happened to me once, but a woman told me "Wait! Don't use that outlet! It kills everything you plug into it.". I checked, and the outlet had 244vac available. Someone had connected a different hot to each side of the outlet. I fixed it for her, and then checked all her other outlets, just to be safe. It was the only one; not sure if someone did it on purpose to run a window a/c, or if they were just insane.
https://www.harborfreig
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18 Comments
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$7 harborfreight
https://www.harborfreig
$7 amazon
https://www.amazon.com/Gardner-Be...B00170KUPC
$9 and up if you do want lcd because 3-lights code is confusing and scary
https://www.amazon.com/s?k=Recept..._s
edit:
Thanks vid1900 for LCD function explanation below!
https://slickdeals.net/f/19836492-klein-tools-rt250-gfci-outlet-tester-w-lcd-display-19-98-free-shipping-w-prime-or-on-35?p=185885079#
tide:
Our community has rated this post as helpful. If you agree, why not thank CyanTest728
https://www.harborfreig
Our community has rated this post as helpful. If you agree, why not thank vid1900
https://www.amazon.com/s?k=Recept..._s
:tide
The screen is to give you the GFCI trip time (older/defective GFCI will often still trip, but take too many milliseconds to do so). After 15 or so years, they may trip with the self-test button, but not with an external tester. That is why the home inspector will flag certain GFCI, even though they appear to 'work'.
The other reason the LCD is useful, is that it will read the voltage at the outlet. This only happened to me once, but a woman told me "Wait! Don't use that outlet! It kills everything you plug into it.". I checked, and the outlet had 244vac available. Someone had connected a different hot to each side of the outlet. I fixed it for her, and then checked all her other outlets, just to be safe. It was the only one; not sure if someone did it on purpose to run a window a/c, or if they were just insane.
The screen is to give you the GFCI trip time (older/defective GFCI will often still trip, but take too many milliseconds to do so). After 15 or so years, they may trip with the self-test button, but not with an external tester. That is why the home inspector will flag certain GFCI, even though they appear to 'work'.
The other reason the LCD is useful, is that it will read the voltage at the outlet. This only happened to me once, but a woman told me "Wait! Don't use that outlet! It kills everything you plug into it.". I checked, and the outlet had 244vac available. Someone had connected a different hot to each side of the outlet. I fixed it for her, and then checked all her other outlets, just to be safe. It was the only one; not sure if someone did it on purpose to run a window a/c, or if they were just insane.
Our community has rated this post as helpful. If you agree, why not thank vid1900
Of course, then you would probably break out a multimeter and check the voltage from ground to Hot and ground to Neutral. If both read 120vac then you know where you are at.
It also shows if you have less than 30vac, for those times where you have the breaker off, but there is still a small amount of voltage at the outlet. This is usually older homes that still have some knob&tube hidden somewhere, and somebody has "stolen the Neutral" from another branch.
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Our community has rated this post as helpful. If you agree, why not thank obtuseness
The screen is to give you the GFCI trip time (older/defective GFCI will often still trip, but take too many milliseconds to do so). After 15 or so years, they may trip with the self-test button, but not with an external tester. That is why the home inspector will flag certain GFCI, even though they appear to 'work'.
The other reason the LCD is useful, is that it will read the voltage at the outlet. This only happened to me once, but a woman told me "Wait! Don't use that outlet! It kills everything you plug into it.". I checked, and the outlet had 244vac available. Someone had connected a different hot to each side of the outlet. I fixed it for her, and then checked all her other outlets, just to be safe. It was the only one; not sure if someone did it on purpose to run a window a/c, or if they were just insane.
The screen is to give you the GFCI trip time (older/defective GFCI will often still trip, but take too many milliseconds to do so). After 15 or so years, they may trip with the self-test button, but not with an external tester. That is why the home inspector will flag certain GFCI, even though they appear to 'work'.
The other reason the LCD is useful, is that it will read the voltage at the outlet. This only happened to me once, but a woman told me "Wait! Don't use that outlet! It kills everything you plug into it.". I checked, and the outlet had 244vac available. Someone had connected a different hot to each side of the outlet. I fixed it for her, and then checked all her other outlets, just to be safe. It was the only one; not sure if someone did it on purpose to run a window a/c, or if they were just insane.
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Aren't 240v receptacles different?
If some hack flipper runs through an old house, converting everything into "Decora" style outlets, they might put 240vac into a normal outlet.
Or if 2 separate circuits are in one box, people can become confused (especially with cloth wiring).
Or someone had a 240vac outlet for a window air conditioner, and then got central air; the next homeowner may have commandeered that outlet into a Frankenstein.
Or people do dumb stuff like have a 240v outlet for their European lava lamps, but use a standard outlet and convert the cord "because I know what that outlet is for". When they die, the next homeowner has no idea that outlet is a 240.
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