A studio shot of the Klein Tools ET310 kit showing the handheld digital circuit breaker receiver and the matching GFCI outlet transmitter. Both components feature a rugged orange and black plastic housing.
Product infographic for the ET310 highlighting key features with callout lines: visual and audible indicators on the receiver tip, a button to test GFCI devices on the transmitter, and a docking port where the transmitter stores inside the base of the receiver.
Close-up diagram of the ET310 transmitter showing the GFCI test button, a list of wiring condition codes, and three light indicators. A corresponding table explains various light combinations for conditions such as Open Ground, Open Hot, and Correct Wiring.
Side-by-side view of the ET310 digital circuit breaker receiver standing vertically next to the compact GFCI outlet transmitter, shown against a plain white background.
An angled view of the Klein Tools ET310 with the transmitter securely docked into the bottom of the receiver, demonstrating how the two pieces fit together for unified storage.
The ET310 receiver and transmitter shown apart, angled to illustrate how the three-pin plug of the transmitter aligns with the storage outlet on the bottom of the handheld receiver.
A horizontal view of the ET310 system with the transmitter positioned just outside the receiver's storage dock, highlighting the L-shaped ergonomic design of the receiver handle.
A perspective shot of the ET310 kit components laid out on a white surface, showing the receiver's power/reset button and the transmitter's North American style grounded plug.
A studio shot of the ET310 transmitter docked into the receiver, showing the full combined length of the tool and the clear labeling for the GFCI tester indicators.
Action shot of a technician using the ET310 receiver to scan a gray electrical panel. The tip of the receiver is glowing green, indicating it has successfully located the correct circuit breaker.
Close-up action shot of a person’s hand plugging the orange ET310 transmitter into a standard white North American grounded electrical outlet to test the circuit wiring.
Digital Circuit Breaker Finder with GFCI Outlet Tester (ET310) promotional video
A studio shot of the Klein Tools ET310 kit showing the handheld digital circuit breaker receiver and the matching GFCI outlet transmitter. Both components feature a rugged orange and black plastic housing.
Product infographic for the ET310 highlighting key features with callout lines: visual and audible indicators on the receiver tip, a button to test GFCI devices on the transmitter, and a docking port where the transmitter stores inside the base of the receiver.
Close-up diagram of the ET310 transmitter showing the GFCI test button, a list of wiring condition codes, and three light indicators. A corresponding table explains various light combinations for conditions such as Open Ground, Open Hot, and Correct Wiring.
Side-by-side view of the ET310 digital circuit breaker receiver standing vertically next to the compact GFCI outlet transmitter, shown against a plain white background.
An angled view of the Klein Tools ET310 with the transmitter securely docked into the bottom of the receiver, demonstrating how the two pieces fit together for unified storage.
The ET310 receiver and transmitter shown apart, angled to illustrate how the three-pin plug of the transmitter aligns with the storage outlet on the bottom of the handheld receiver.
A horizontal view of the ET310 system with the transmitter positioned just outside the receiver's storage dock, highlighting the L-shaped ergonomic design of the receiver handle.
A perspective shot of the ET310 kit components laid out on a white surface, showing the receiver's power/reset button and the transmitter's North American style grounded plug.
A studio shot of the ET310 transmitter docked into the receiver, showing the full combined length of the tool and the clear labeling for the GFCI tester indicators.
Action shot of a technician using the ET310 receiver to scan a gray electrical panel. The tip of the receiver is glowing green, indicating it has successfully located the correct circuit breaker.
Close-up action shot of a person’s hand plugging the orange ET310 transmitter into a standard white North American grounded electrical outlet to test the circuit wiring.
Digital Circuit Breaker Finder with GFCI Outlet Tester (ET310) promotional video
KLEIN TOOLS

Klein Tools ET310 Digital Circuit Breaker Finder and GFCI Outlet Tester Kit Accurate Breaker Locating Tool 90-120V AC North American Grounded Outlets

In stock
SKU: ET310
$49.97

Description

Quickly Locate Breakers and Test GFCI Outlets with Professional Accuracy

The Klein Tools ET310 Digital Circuit Breaker Finder with Integrated GFCI Outlet Tester is the essential diagnostic tool for electricians and DIY enthusiasts alike. This innovative two-part system takes the guesswork out of electrical maintenance by allowing a single user to quickly and accurately identify the correct circuit breaker in a crowded panel corresponding to a specific electrical outlet or fixture. The transmitter connects directly to a grounded outlet, while the handheld receiver provides clear visual and audible signals as it scans the panel, ensuring you hit the right breaker every time without unnecessary power cycles.

Beyond locating breakers, the ET310 features an integrated GFCI outlet tester that inspects the wiring condition of North American grounded outlets. It is engineered for durability, built to withstand a 6.6-foot drop, and features a convenient docking design where the transmitter snaps into the receiver for easy storage in your tool bag. With a CAT II 120V safety rating and energy-saving automatic power-off features, this kit provides a safe and reliable solution for residential and commercial troubleshooting on 90-120V AC circuits.

Key Features

  • Precision Breaker Locating: Quickly and accurately identifies the correct circuit breaker in a panel corresponding to a connected outlet or fixture.
  • Integrated GFCI Tester: Inspects wiring conditions and tests GFCI devices for proper operation.
  • Visual and Audible Alerts: Receiver delivers clear signals to indicate when the correct breaker has been successfully located.
  • Durable Design: Robust construction built to withstand a 6.6-foot (2 meter) drop on the jobsite.
  • Smart Storage: Transmitter docks securely into the receiver for convenient, one-piece storage.
  • Battery Conservation: Receiver features a low battery indicator and powers off automatically after three minutes of non-use.
  • Wide Range Operation: Specifically designed for 90-120V AC North American grounded electrical circuits.
  • Safety Rated: CAT II 120V safety rating for reliable measurement at socket outlets.

What's Included

  • (1) Digital Circuit Breaker Finder Receiver
  • (1) Integrated GFCI Transmitter
  • (1) 9V Battery (for Receiver)
  • (1) User Manual

Specifications

Specification Details
Type Electronic Tester
Application Locate Circuit Breakers; Test GFCI Devices
Voltage Range 90 - 120V AC
Safety Rating CAT II 120V
Overall Length 10.96 Inches
Overall Height 2.16 Inches
Overall Width 1.39 Inches
Weight 7.2 oz
Drop Protection 6.6 Feet (2 Meters)
Battery Required 1 x 9V (Included)
Housing Material PC & PC-ABS

Pro-Tip: For the most accurate results, scan the panel once without stopping to calibrate the receiver. On the second pass, the receiver will ignore weaker signals and pinpoint the exact breaker with maximum precision. Always ensure the transmitter is plugged in before you begin your scan!