Klein Tools GFCI Outlet Tester...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$68.69
$13.98
Klein Tools GFCI Outlet Tester

Klein Tools GFCI Outlet Tester 110/125V AC 3-Wire Receptacle Professional Grade

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Model: RT210
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$68.69
$13.98
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Klein Tools GFCI Outlet Tester 110/125V AC 3-Wire Receptacle Professional Grade

Professional-Grade GFCI Testing Equipment for Electrical Safety

The Klein Tools GFCI Outlet Tester delivers professional-grade electrical testing performance for GFCI receptacle verification and outlet wiring diagnosis. This compact testing instrument features advanced fault detection technology designed for electricians, electrical contractors, and maintenance professionals, providing the reliable performance and industry-leading quality that tradesmen demand from America's most trusted electrical tool manufacturer.

Professional Features & Benefits

GFCI Testing Performance

  • GFCI Operation Verification - Tests and confirms proper operation of ground fault protective devices with Klein Tools precision engineering
  • Wiring Problem Detection - Identifies the most common wiring faults in standard and GFCI receptacles for comprehensive electrical safety
  • 110/125V AC Compatibility - Works on standard 3-wire outlets at 50/60Hz for versatile electrical testing applications
  • Convenient Reference Chart - Built-in diagnostic chart provides instant fault identification for efficient troubleshooting

Durability & Safety Standards

  • Drop Protection Design - Built to withstand 6.6-foot drops with Klein Tools rugged construction for jobsite reliability
  • Wide Operating Range - Functions in temperatures from 32°F to 140°F for year-round electrical testing performance
  • Professional Safety Rating - CAT II 300V safety standard ensures protection during electrical testing operations

Technical Specifications

Compact dimensions of 1.62" length x 1.88" width x 2.88" height, weighing only 0.123 lbs for portable testing. Operates on 110/125V AC at 50/60Hz in 3-wire outlets. Operating temperature range 32°F to 140°F (0°C to 40°C). Drop protection rated to 6.6 feet (2m). CAT II 300V safety standard compliance for professional electrical work.

Installation & Usage

  1. Verify outlet power is ON and circuit breaker is in proper position before testing
  2. Insert tester into 3-wire GFCI or standard receptacle ensuring proper plug alignment
  3. Read LED indicator pattern and compare to built-in reference chart for fault diagnosis
  4. Press GFCI test button to verify ground fault protection operation and response time
  5. Press GFCI reset button to restore normal operation after successful testing
  6. Document test results and consult qualified electrician for any wiring problems identified

Professional Applications

Ideal for:

  • Electrical Installation - New construction GFCI testing and outlet wiring verification for code compliance
  • Maintenance Testing - Routine GFCI function testing in commercial and residential electrical systems
  • Safety Inspections - Electrical safety audits and OSHA compliance testing in industrial facilities
  • Troubleshooting - Diagnosing outlet wiring problems and GFCI device malfunctions
  • Residential Service - Home electrical service calls and outlet safety verification
  • Commercial Electrical - Office building and retail facility electrical system testing
  • Industrial Maintenance - Manufacturing facility electrical safety testing and preventive maintenance
  • Educational Facilities - School and university electrical system safety verification

Compact Design Advantage

Klein Tools engineering delivers professional-grade testing capability in an ultra-compact form factor that fits easily in tool pouches and electrical bags. The rugged construction withstands daily jobsite use while the intuitive LED display and reference chart enable quick fault diagnosis without complex interpretation, making it essential for electrical professionals who demand reliable GFCI testing performance.

Why Choose Klein Tools Quality?

Since 1857, Klein Tools has maintained its commitment to manufacturing the highest quality electrical testing equipment for professional tradesmen. This GFCI outlet tester represents over 165 years of electrical tool innovation, featuring precision engineering, rigorous safety testing, and the durability standards that have made Klein Tools the most trusted name among electricians, electrical contractors, and maintenance professionals nationwide.



KLN-RT210 - spec sheet

Manufacturer Resources

Product Specs

Application:
Determine Wiring Condition in Outlet
Drop Protection:
6.6' (2 m)
Gfci:
Yes
Overall Height:
2.88" (7.3 cm)
Overall Length:
1.62" (4.1 cm)
Overall Width:
1.88" (4.8 cm)
Standard:
CAT II 300V
Product Type:
GFCI Receptacle Tester
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Electrical Testers
Product Voltage:
110/125V AC at 50/60Hz in 3-Wire Outlet
Product Details:
GFCI Receptacle Tester
Product Height:
1.6250 in
Product Category:
Standard GFCI Testers
Product Weight:
0.1230 lbs
Product Width:
1.8750 in
Product Depth:
3.0000 in

Klein Tools RT210 – Frequently Asked Questions

1) Will the Klein RT210 GFCI tester work on a standard 120V outlet, or does it only test GFCI receptacles?
The RT210 works on any standard 3-wire 110/125V AC receptacle at 50/60Hz, GFCI or not. On a plain duplex outlet it reads the wiring condition and shows the fault pattern on its LEDs; on a GFCI receptacle it does that plus trips the device with the test button so you can confirm the ground fault protection actually operates. Note the voltage range: it's a 110/125V tool, so it's not for 240V receptacles or 208/277V commercial circuits.
2) Is the Klein RT210 rated CAT II, and is that enough for commercial panel and branch circuit work?
CAT II 300V is the rating on the RT210. That covers receptacle-level and plug-connected loads on branch circuits, which is exactly where this tool lives. It is not a CAT III or CAT IV instrument, so it does not belong at the service entrance, on distribution panels, or on feeders. For a maintenance tech checking outlets throughout a building, CAT II 300V is the correct class; for anyone opening a panel, you want a separate meter rated for that location.
3) Can I leave a Klein RT210 outlet tester in the truck year-round, and will it survive being dropped off a ladder?
Drop protection is rated to 6.6 feet (2 m), so a fall from a stepladder or off a bench isn't going to end it. Operating temperature runs 32F to 140F (0C to 40C), which covers a hot attic or a summer truck bed but means it won't read reliably below freezing, so bring it in from an unheated van in winter before testing.
4) Do I need a chart or a manual to read what the Klein RT210 is telling me?
No separate reference needed. The fault chart is printed on the tester body, so you read the LED pattern and match it right there on the tool. That matters for a property maintenance crew or an apprentice doing a sweep of outlets, nobody has to remember which combination means reversed hot and neutral versus an open ground.
5) Does the Klein RT210 tester tell me the actual voltage at the outlet?
No. The RT210 is a receptacle tester, not a meter. It determines the wiring condition in the outlet and verifies GFCI operation, reporting through LED patterns rather than a numeric reading. If you need to see actual voltage, or check for voltage drop under load, you need a multimeter alongside it. The two tools do different jobs and most service techs carry both.
6) Can I use the Klein RT210 to test the GFCI breaker in the panel, not just the receptacle?
You test it from the receptacle side. Plug the RT210 into any 3-wire 110/125V outlet on the protected circuit and press the test button; if the circuit is fed by a GFCI breaker, the breaker trips and you've confirmed the protection works on that outlet. You then reset at whichever device tripped. The tool itself never goes in the panel, and its CAT II 300V rating means it shouldn't.
7) How small is the Klein RT210 tester, will it ride in a pouch?
It measures 2.88 inches high, 1.88 inches wide and 1.62 inches long, and weighs 0.123 lbs. That is pouch and shirt-pocket territory, light enough that a tech carrying it on every service call won't leave it behind in the van.
8) What is the Klein RT210 part number and how do I order the right one?
The manufacturer part number is RT210 from Klein Tools, and it's a single-model item, there are no finish, voltage or configuration options to specify. One part number covers it.
How fast can I get the Klein Tools RT210 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 Klein Tools RT210 come with a warranty?
Absolutely. The Klein Tools RT210 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 Klein Tools RT210?
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 Klein Tools RT210 from ZenSupply?
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