Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Tester

Find the right breaker faster with confidence

The Klein Tools ET310 Circuit Breaker Finder with Integrated GFCI Outlet Tester is designed to simplify electrical troubleshooting by helping you identify the correct circuit breaker connected to an outlet or fixture. The system combines a transmitter that attaches to the outlet with a receiver that scans the panel, delivering a focused, hands-on workflow for professionals and curious homeowners alike.

When you work in busy panels or cramped spaces, clear cues matter. The ET310 delivers both visual indicators and audible cues at the moment the correct breaker is found, so you’re guided through the process without guesswork. This isn’t just about speed; it’s about a steadier hand and fewer interruptions while you diagnose and resolve electrical concerns.

How the ET310 works

• ACCURATE BREAKER IDENTIFICATION: quickly pinpoint the correct breaker with precision, reducing trial-and-error in panel work.
• TWO-PART SYSTEM: a Transmitter connected to the outlet or fixture pairs with a Receiver that scans the panel for easy identification.
• CLEAR INDICATIONS: the Receiver offers both visual signals and audible cues when the match is found, making the process intuitive.
• WIDE COMPATIBILITY: designed for 90–120V AC circuits, suitable for many common electrical systems and installations.
• BUILT-IN GFCI TESTER: the Transmitter includes a GFCI outlet tester to inspect wiring conditions and check GFCI devices on site.
• CONVENIENT STORAGE: the Transmitter docks into the Receiver for compact, all-in-one storage when not in use.
• UNIVERSAL CONNECTIVITY: a three-pin plug supports North-American grounded outlets for seamless compatibility.

Why you might consider the ET310

• Efficiently locate the correct circuit in crowded panels, saving time during electrical troubleshooting.
• Verify GFCI outlets on the same workflow, reducing the need for separate tests.
• Keep gear organized with a built-in docking solution that pairs components together.
• Rely on a tool designed for professional use, built to handle the demands of daily field work.

Whether you’re a skilled electrician or a dedicated DIYer, the ET310 offers practical capabilities to support informed, safer electrical work. It presents possibilities for faster troubleshooting, clearer validation of circuit boundaries, and a cohesive approach to on-site testing—without promising outcomes beyond what the data suggests.