Greenlee 50121251 GT-10GFI GFI...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$86.07
$36.07
Greenlee 50121251 GFI Circuit Tester

Greenlee 50121251 GT-10GFI GFI Circuit Tester, 120 VAC Rated, ETL Tested

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Model: 50121251
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$86.07
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Greenlee GT-10GFI GFI Circuit Tester, 120 VAC Rated, ETL Tested

The Greenlee GT-10GFI GFI Circuit Tester is a compact, purpose-built diagnostic tool designed to troubleshoot 120 VAC grounded outlets and verify ground-fault interrupter operation. Electricians and maintenance technicians rely on this tester to quickly confirm proper wiring conditions at 120 VAC receptacles, helping identify open grounds, reversed polarity, and other common wiring faults before they become safety hazards. Measuring just 6.700 IN long, 1.900 IN wide, and 1.200 IN high, the GT-10GFI slips easily into a tool pouch or kit for fast use during service calls, new construction rough-in checks, and routine facility maintenance rounds. Backed by ETL testing standards and a lifetime limited warranty from Greenlee, this tester is built for reliable, repeatable performance on the job site.

Key Features

  • Application: Used to troubleshoot 120 VAC grounded outlets, letting technicians confirm correct wiring conditions before energizing equipment or handing off a job.
  • Voltage Rating: Rated for 120 VAC circuits, matching the standard household and commercial receptacle voltage most frequently serviced in the field.
  • Compact Dimensions: Measures 6.700 IN in length, 1.900 IN in width, and 1.200 IN in height, making it easy to carry in a tool pouch or kit without adding bulk.
  • Lifetime Limited Warranty: Backed by a lifetime limited warranty from Greenlee, reflecting confidence in the tester's build quality and long-term reliability.
  • Model Designation: Identified as model GT-10GFI, the Greenlee designation for this specific GFI circuit tester configuration.
  • Compliance Testing: Meets ETL testing standards, supporting confidence in performance and safety for professional electrical use.

Certifications & Compliance

  • ETL Tested

Technical Specifications

  • Application: Use To Troubleshoot 120 VAC Grounded Outlets
  • Country Of Origin: CN
  • Product Height: 1.200 IN
  • Product Length: 6.700 IN
  • Product Model: GT-10GFI
  • Product Width: 1.900 IN
  • Standards: ETL
  • Voltage Rating: 120 VAC
  • Volume: 15.276 CI

Typical Applications

  • Troubleshooting 120 VAC Grounded Outlets
  • Residential and Commercial Electrical Service Calls
  • Facility Maintenance Electrical Checks
  • Verifying Ground-Fault Protection Devices
  • New Construction Receptacle Verification

Why Greenlee?

Greenlee is a trusted name among electrical professionals, and the GT-10GFI GFI Circuit Tester continues that reputation with a compact, ETL-tested design backed by a lifetime limited warranty. Its small footprint of 6.700 IN by 1.900 IN by 1.200 IN means it travels well in a service van or tool bag, while its 120 VAC voltage rating matches the receptacles technicians encounter most often on residential and commercial job sites. For technicians who need a dependable, code-relevant way to confirm 120 VAC grounded outlet wiring and ground-fault interrupter operation in the field, the Greenlee GT-10GFI delivers straightforward, repeatable diagnostic performance backed by ETL testing standards and Greenlee's lifetime limited warranty commitment.

Manufacturer Resources

Product Specs

Application:
Use To Troubleshoot 120 VAC Grounded Outlets
Country Of Origin:
CN
Product Height:
1.200 IN
Product Length:
6.700 IN
Product Model:
GT-10GFI
Product Type:
Circuit Tester
Product Width:
1.900 IN
Standards:
ETL
Voltage Rating:
120 VAC
Volume:
15.275999999999998 CI
Department:
Electrical
Product Subgroup:
Testing & Measurement

Greenlee 50121251 – Frequently Asked Questions

1) What can the Greenlee GT-10GFI circuit tester actually check on an outlet?
The Greenlee 50121251 (model GT-10GFI) is built to troubleshoot 120 VAC grounded outlets. You plug it into the receptacle and use it to check wiring condition on standard grounded 120-volt circuits, including tripping GFCI protection on a GFI receptacle. It is rated for 120 VAC, so it is not a tool for 240-volt circuits or ungrounded two-prong receptacles.
2) Will a GFI circuit tester work on a 240V circuit or an old two-prong outlet?
No. The Greenlee 50121251 is a 120 VAC tester intended for grounded outlets only. On a two-prong ungrounded receptacle there is no equipment ground for it to reference, and it should not be used on 240-volt circuits. For those openings you need a different instrument.
3) Is a plug-in GFI tester enough, or do I need a multimeter for outlet troubleshooting?
A plug-in tester like the Greenlee GT-10GFI answers the fast questions on 120 VAC grounded receptacles: is the wiring right, and does the GFCI trip. It does not give you a numeric voltage or resistance reading. Property maintenance and MRO crews walking a building to verify outlets get their answer from the plug-in tester; if you need to measure actual voltage or chase a fault back to the panel, pair it with a multimeter.
4) How big is the Greenlee GFI outlet tester, and will it fit in a pouch?
It measures 6.700 inches long, 1.900 inches wide and 1.200 inches high, roughly 15.28 cubic inches of volume. That is a slim plug-in body that drops into a tool pouch or a service van bin without taking a slot.
How fast can I get the Greenlee 50121251 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Greenlee 50121251 come with a warranty?
Absolutely. The Greenlee 50121251 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Greenlee 50121251?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Greenlee 50121251 from ZenSupply?
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