3-Prong Outlet Tester: Picks and Buying Checks
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A 3-prong outlet tester plugs into a standard grounded receptacle and shows common wiring problems with lights or a display. All six products here are outlet testers, and two are aimed at GFCI outlets.
A plug-in tester shows the condition at the outlet only, so follow the manual and call a licensed electrician for wiring problems.
Quick answer
The Klein Tools RT110 is the best-known name and states 5.5 x 3.5 x 1.8 inches. The GroundLuxe is the smallest at 3.25 x 1.45 x 1 inches. The Goldeep and Southwire are the two GFCI-focused listings, at 2.88 and 1.92 ounces. Southwire names 7 test functions.
Match the tester to the outlets you need to check and read the indicator layout on the product page.
Comparison table
| Product | Focus | Style | Weight or size | Power source |
|---|---|---|---|---|
| Klein Tools RT110 | AC receptacle tester | Standard | 5.5 x 3.5 x 1.8 in | Hand Powered |
| EOHELGRO | Standard AC outlets | Compact | Not stated | Corded Electric |
| GroundLuxe | Grounding products | Compact | 3.25 x 1.45 x 1 in | Corded Electric |
| NHIDKU | North American outlets | Grounding | Not stated | Corded Electric |
| Goldeep | GFCI outlets | GFCI Outlet Tester | 2.88 oz | Battery Powered |
| Southwire | GFCI, 7 test functions | Newer Model | 1.92 oz | Corded Electric |
The products in detail
Klein Tools RT110 Outlet Tester, AC Electrical Receptacle Tester
An AC receptacle tester for North American outlets. The fields give a power source of Hand Powered, a Standard style, a Factory color entry and dimensions of 5.5 x 3.5 x 1.8 inches.
Who it suits: A buyer who wants a known tool brand and stated dimensions.
Pros
- Title names North American outlets
- Dimensions stated: 5.5 x 3.5 x 1.8 inches
Cons
- The fields do not list the fault conditions it indicates
- The color entry reads Factory, which is not a normal color name
Skip if: You need the indicator layout confirmed from the listing.
View the Klein Tools RT110 on Amazon (affiliate link)
EOHELGRO Outlet Tester, Socket Tester for North American AC Outlets
A socket tester for standard North American AC outlets with a plug security test named in the title. The fields give corded power, a Compact style, a yellow body and a multimeter measurement type.
Who it suits: A buyer who wants a compact yellow plug-in tester.
Pros
- Title names standard North American AC outlets
- Compact style
Cons
- No weight or dimensions are stated
- The fields do not describe the indicators
Skip if: You need size and indicator details from the listing.
View the EOHELGRO outlet tester on Amazon (affiliate link)
GroundLuxe Outlet Tester for Grounding Products
An outlet tester for testing receptacles and sockets for proper wiring on grounding products. The fields give corded power, a Compact style, a white body and dimensions of 3.25 x 1.45 x 1 inches.
Who it suits: A buyer who wants the smallest stated size in this group.
Pros
- Smallest stated dimensions: 3.25 x 1.45 x 1 inches
- Title names testing for proper wiring
Cons
- The fields do not describe which faults the lights show
Skip if: You need the fault indicators confirmed from the listing.
View the GroundLuxe tester on Amazon (affiliate link)
NHIDKU Outlet Tester with Electrical Receptacle Test
An outlet tester for North American outlets, listed in yellow. The fields give corded power, a Grounding style and an ohmmeter measurement type.
Who it suits: A buyer who wants a yellow tester with a grounding style.
Pros
- Grounding style listed
- Title names North American outlets
Cons
- No weight or dimensions are stated
- The ohmmeter measurement type is not explained
Skip if: You need to know the size and indicator layout from the listing.
View the NHIDKU outlet tester on Amazon (affiliate link)
Goldeep GFCI Outlet Tester, Plug-In Receptacle and Ground Tester
A GFCI outlet tester that plugs in as a receptacle and ground tester. The fields give battery power, a GFCI Outlet Tester style, a green body and a weight of 2.88 ounces.
Who it suits: A buyer who also wants to check GFCI outlets.
Pros
- Title names GFCI and ground testing
- Weight stated as 2.88 ounces
Cons
- The fields list battery power, but the listing does not say what the battery is for or whether one is included
Skip if: You need battery details spelled out.
View the Goldeep GFCI tester on Amazon (affiliate link)
Southwire GFCI Receptacle Tester, Push-Button, 7 Test Functions
A push-button GFCI receptacle tester with a compact, durable housing and 7 test functions named in the title. The fields give corded power, a Newer Model style, a black body and a weight of 1.92 ounces.
Who it suits: A buyer who wants GFCI testing with a push button and the lowest stated weight here.
Pros
- 7 test functions named in the title
- Lowest stated weight, 1.92 ounces
- Push-button GFCI testing
Cons
- No dimensions are stated
- The fields do not list which test functions it performs
Skip if: You need dimensions or the list of functions from the listing.
View the Southwire GFCI tester on Amazon (affiliate link)
Buying checklist
- Decide whether you need a GFCI tester or a standard receptacle tester.
- Check the indicator layout on the product page, since most fields do not list it.
- Compare size only against size and weight only against weight.
- Confirm the plug type, which should be North American for the products here.
- Check what the listed power source means, since several fields look odd for a plug-in tester.
- Call a licensed electrician if the tester shows a wiring fault.
Related guides
These guides cover similar testers:
FAQ
What does a 3-prong outlet tester show?
It plugs into a grounded outlet and shows common wiring problems with lights or a display. Check the product page for the exact faults each model indicates.
Which listings are for GFCI outlets?
The Goldeep GFCI Outlet Tester and the Southwire GFCI Receptacle Tester name GFCI in their titles.
Which one is the smallest?
The GroundLuxe, at 3.25 x 1.45 x 1 inches. The Klein Tools RT110 is 5.5 x 3.5 x 1.8 inches. The other listings state no dimensions.
Do these testers replace an electrician?
No. A plug-in tester only shows the condition at one outlet. If it shows a wiring fault, call a licensed electrician.
Why do some power source fields look odd?
The listings say Hand Powered, Corded Electric or Battery Powered for plug-in testers. The fields do not explain this, so check the product page for what each entry means.
Closing note
Pick the tester that matches your outlets, and treat any listing that does not describe its indicators as something to read about on the product page before you buy.
