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Two-piece circuit breaker finder with transmitter docked in receiver, yellow and black plastic housing, three-pin plug visible

Klein Tools

Klein Tools ET310 Digital Circuit Breaker Finder with GFCI Tester

SKU CH-4DPH-9JG1X

Locates the correct circuit breaker in a panel for 90-120V AC circuits and includes a GFCI outlet tester

  • Brand nameKlein Tools
  • Locate the right breaker fast with clear visual and audible signals
  • Verify outlet wiring and test GFCI devices using the built-in transmitter tester
  • Scan panels on 90-120V AC circuits for accurate identification
  • Keep both parts together as one compact unit with docked storage
  • Connect directly to North-American grounded outlets via three-pin plug

Digital Circuit Breaker Finder

The Klein Tools ET310 is a digital circuit breaker finder designed for electricians and technicians who need to identify the correct breaker in a panel. It consists of a Transmitter that connects to an outlet or fixture and a Receiver used to scan the panel. The tool operates on 90-120V AC circuits and provides clear visual and audible indications when the correct breaker is located.

Transmitter with GFCI Outlet Tester

The Transmitter incorporates a GFCI outlet tester to inspect wiring conditions and test GFCI devices at the electrical outlet. This replaces the need for a separate GFCI tester when verifying outlet wiring before tracing a circuit. The jump is worth it for professionals who want to confirm outlet safety and locate the supplying breaker in a single workflow.

Docking Storage and Three-Pin Plug

The Transmitter docks inside the Receiver for convenient storage as a single item when not in use. Installation is straightforward: plug the Transmitter into a North-American-style grounded outlet using its three-pin plug and scan the panel with the Receiver. A common issue occurs if the outlet wiring is faulty, which the integrated GFCI tester will indicate before tracing begins.

How it compares

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Price $45.99
Pricier than about 55% of the 677 comparable items (median $33.99).

Specifications

Product
Brand nameKlein Tools

Questions about this item

What type of outlet does the transmitter plug into for testing?

The transmitter uses a three-pin plug designed for standard North-American-style grounded electrical outlets.

How do I start using the finder to locate a breaker?

Plug the transmitter into the outlet or fixture, then scan the panel with the receiver until the visual and audible signals indicate the correct breaker.

What powers the transmitter and receiver during operation?

The unit operates on 90-120V AC circuits; the transmitter draws power from the outlet under test while the receiver is battery powered.

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