Klein Tools ET310 AC Circuit Breaker Finder with Integrated GFCI Tester

Find the right circuit faster with Klein Tools ET310

The Klein Tools ET310 Circuit Breaker Finder combines a transmitter that connects to the outlet or fixture with a handheld receiver that scans the electrical panel. This two-part system helps you identify the correct breaker with clarity, reducing guesswork during electrical troubleshooting and maintenance tasks.

How the ET310 works

In use, the Transmitter attaches to the target outlet or fixture and sends a signal through the circuit. The Receiver reads breakers in the panel and offers clear feedback to guide you to the right location.

• Transmitter connects to the outlet or fixture in the circuit, enabling signal flow to the panel.
• Receiver scans the panel and indicates the matching breaker with visual cues and an audible alert.

Built-in safety testing and broad compatibility

The Transmitter includes a GFCI outlet tester, so you can quickly check wiring conditions and inspect GFCI devices as part of your verification workflow. The system operates on 90–120V AC, covering common residential installations.

• GFCI tester provides quick outlet condition checks for safety awareness.
• 90–120V AC operation supports most North American circuits.

Design that keeps your tools organized

When not in use, the Transmitter docks in the Receiver, keeping both components together and ready. The kit uses a three-pin plug for easy connection to North American grounded outlets, ensuring seamless compatibility across compatible panels.

With more than six generations of engineering expertise, Klein Tools delivers a thoughtful, durable solution that supports practical, informed diagnostics in daily professional use. The ET310 is designed to complement a professional workflow without promising guaranteed outcomes.