Klein Tools Digital Circuit Br...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$129.71
$55.88
Klein Tools Digital Circuit Breaker Finder with GFCI Outlet Tester

Klein Tools Digital Circuit Breaker Finder with GFCI Outlet Tester 90-120V AC Auto Power Off

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Model: ET310
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$129.71
$55.88
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Klein Tools Digital Circuit Breaker Finder with GFCI Outlet Tester

Professional-Grade Circuit Identification and GFCI Testing System

The Klein Tools Digital Circuit Breaker Finder with GFCI Outlet Tester delivers professional-grade circuit identification performance for electrical troubleshooting and panel mapping. This PC and PC-ABS housing electronic tester features integrated GFCI testing capability 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

Advanced Circuit Detection Technology

  • Digital Signal Processing - Delivers clear visual and audible indications when correct breaker is located with Klein precision engineering
  • 90-120V AC Operation - Works on standard North American electrical systems with professional reliability
  • Integrated GFCI Tester - Inspects outlet wiring condition and tests GFCI devices for comprehensive electrical safety verification
  • Three-Pin Grounded Plug - Connects to standard North American outlets with secure professional-grade connection

Professional Convenience Features

  • Docking Transmitter Design - Transmitter docks in receiver for convenient single-unit storage and transport
  • Auto Power Off - Receiver automatically powers off after three minutes to conserve battery life with Klein smart design
  • Low Battery Indicator - Alerts user to battery condition for reliable field operation
  • Drop Protection - Built to withstand 6.6-foot drops for jobsite durability and Klein quality construction

Safety and Durability Standards

  • CAT II 120V Safety Rating - Meets measurement category standards for utilization point testing with professional safety compliance
  • Professional Construction - PC and PC-ABS housing provides impact resistance and long-term reliability for electrical professionals
  • Battery-Free Transmitter - Powered by circuit under test eliminates need for transmitter batteries and ensures consistent operation

Technical Specifications

Overall dimensions 10.96 inches length x 2.16 inches width x 1.39 inches height with transmitter docked, operates on 90-120V AC circuits, CAT II 120V safety rating, PC and PC-ABS housing construction, 0.625 pounds total weight, requires one 9V battery for receiver operation, 6.6-foot drop protection rating, auto power off after three minutes, measurement category II compliance for utilization point testing.

Installation & Usage

  1. Verify tester operation on known live and correctly wired receptacle before each use emphasizing Klein safety protocols
  2. Connect transmitter to electrical outlet or fixture requiring circuit identification using professional connection techniques
  3. Activate GFCI testing function to verify outlet wiring condition and GFCI device operation with Klein precision
  4. Use receiver to scan electrical panel systematically following professional electrical troubleshooting procedures
  5. Listen for audible indication and observe visual signals when correct breaker is located using Klein detection technology
  6. Document circuit identification for future reference following professional electrical maintenance standards

Professional Applications

Ideal for:

  • Electrical Panel Mapping - Circuit identification and panel labeling for residential and commercial electrical systems
  • Troubleshooting Operations - Locating specific circuits during electrical repair and maintenance work
  • GFCI Testing - Verifying GFCI outlet operation and wiring integrity for safety compliance
  • Electrical Installation - Circuit verification during new construction and renovation projects
  • Maintenance Operations - Routine electrical system testing and circuit identification for facility management
  • Safety Inspections - Electrical outlet testing and circuit verification for code compliance
  • Commercial Electrical Work - Panel mapping and circuit identification in office buildings and retail facilities
  • Industrial Maintenance - Circuit troubleshooting and electrical system mapping in manufacturing environments

Digital Detection Advantage

Klein Tools digital circuit breaker finder technology provides superior accuracy and reliability compared to analog tone generators, featuring advanced signal processing that eliminates false readings and ensures precise circuit identification. The integrated GFCI testing capability combines two essential electrical testing functions in one professional tool, reducing equipment requirements and improving workflow efficiency for electrical contractors and maintenance professionals.

Why Choose Klein Tools Quality?

Klein Tools has maintained its commitment to electrical professional excellence since 1857, developing innovative testing equipment that meets the demanding requirements of modern electrical work. This digital circuit breaker finder represents Klein's dedication to combining traditional craftsmanship with advanced electronic technology, providing electricians and electrical contractors with the precision, durability, and safety features essential for professional electrical troubleshooting and system maintenance operations.



KLN-ET310 - spec sheet

Manufacturer Resources

Product Specs

Application:
Locate Circuit Breakers in Panel, Test GFCI Devices
Batteries:
1 x 9V
Included:
Transmitter, Receiver, User Manual, and 9V Battery for Receiver
Overall Height:
2.16" (5.5 cm) (With Transmitter docked in Receiver)
Overall Length:
10.96" (27.8 cm) (With Transmitter docked in Receiver)
Overall Width:
1.39" (3.5 cm) (With Transmitter docked in Receiver)
Standard:
CATII 120V
Product Type:
Electronic Tester
Department:
Electrical
Product Group:
Test & Measurement
Product Subgroup:
Electrical Testers
Product Details:
Electronic Tester
Product Height:
1.3900 in
Product Material:
PC & PC-ABS housing and electronic components
Product Category:
Circuit Breaker Finders
Product Weight:
0.6250 lbs
Product Width:
2.1600 in
Product Depth:
10.9600 in

Klein Tools ET310 – Frequently Asked Questions

1) Will the Klein ET310 circuit breaker finder work on a 240V circuit or a commercial 277V lighting circuit?
No. The ET310 transmitter is built for 90-120V AC and carries a CAT II 120V rating, so it covers standard North American 120V branch circuits only. For tracing a 240V dryer or range circuit, or 277V lighting in a commercial panel, you need a tracer rated for those voltages. On a 120/240V residential panel the ET310 still works fine for every 120V branch, which is most of what gets mapped.
2) Do I need a separate GFCI outlet tester if I buy the ET310 breaker finder?
No, the GFCI tester is built into the ET310 transmitter. Plug it into a receptacle and it checks the outlet wiring condition and trips the GFCI device, so one tool covers both the panel trace and the receptacle check. That is two tools off the belt for anyone doing rental turnovers or annual GFCI verification across a building.
3) Does the Klein ET310 come with everything needed, or do I have to buy batteries?
Everything to start is in the box: transmitter, receiver, user manual, and the 9V battery for the receiver. The transmitter takes no battery at all, it is powered by the circuit it is plugged into, so the only consumable is one 9V for the receiver.
4) Can the Klein ET310 find a breaker for a hardwired light or a circuit with no outlet?
The ET310 transmitter uses a three-pin grounded plug for standard North American receptacles, so a plug-in point is the normal way to energize it. The description does cover connecting the transmitter to an outlet or fixture requiring circuit identification. If your only access is bare conductors in a junction box or a fixture with no receptacle, look for a tracer supplied with alligator-clip or bare-lead adapters instead.
5) How do I know the ET310 breaker finder is reading correctly before I trust it on a panel?
Check it on a receptacle you know is live and correctly wired before each use. That confirms both the transmitter and the receiver are working, so a no-signal result at the panel means you have the wrong panel or a dead circuit, not a dead tool. When you hit the right breaker the receiver gives both an audible and a visual indication.
6) How big is the Klein ET310 and will it fit in a tool pouch?
Docked as one unit, the ET310 measures 10.96 inches long by 2.16 inches high by 1.39 inches wide and weighs 0.625 pounds. The transmitter stores inside the receiver, so it travels as a single slim wand rather than two loose pieces, which is why it drops into a pouch pocket instead of a case.
7) Is the Klein ET310 tough enough for daily jobsite use in a service van?
Rated for 6.6-foot drops, with a PC and PC-ABS housing. That is a drop off a ladder step or out of a panel-height pouch onto concrete. The receiver also shuts itself off after three minutes, so a unit that gets tossed in the van switched on is not dead the next morning, and a low battery indicator warns before the 9V quits mid-trace.
8) What is the ET310 model number and MPN for ordering the Klein breaker finder?
Klein Tools ET310 is the model, and ET310 is the manufacturer part number, ordered as a single kit with transmitter and receiver together. There is one configuration, so there is nothing else to specify on the order.
How fast can I get the Klein Tools ET310 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 ET310 come with a warranty?
Absolutely. The Klein Tools ET310 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 ET310?
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 ET310 from ZenSupply?
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