Klein ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester

Microprocessor-Controlled Digital Calibration. Integrated 3-Wire GFCI Outlet Tester. High-Visibility Visual and Audible Detection Alerts.

The Klein Tools ET310 Circuit Breaker Finder features digital microprocessor calibration, an integrated GFCI tester, and visual/audible indicators to accurately map 90-120V AC circuits without trial-and-error shutdowns.

The Klein Tools ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester brings pinpoint circuit mapping, fast receptacle wiring diagnostics, and reliable safety validation directly to your diagnostic tool pouch. Purpose-built to eliminate the frustrating, time-consuming trial-and-error process of shutting down an entire floor just to isolate a single outlet, the danger of working on mistakenly live lines, and the confusion of weak or bleeding signals at the service panel, this premium professional digital tracing system sets a high-efficiency trades standard. It equips commercial electricians, residential service wiremen, property maintenance crews, and home remodeling contractors with an intuitive dual-unit setup explicitly optimized to map branch breakers fast, catalog miswired outlets, verify functional ground fault interrupters, and log clean panel schedules safely.

Advanced signal isolation physics and automatic sensitivity adjustments serve as the engineering foundation for this robust Klein Tools Circuit Breaker Finder. Operating on standard 90-120V AC branch lines, the system uses a high-performance plug-in transmitter that injects a specialized digital frequency down the line, while the ergonomic hand-held receiver scans the breaker faces. Controlled by an internal microprocessor, the receiver automatically adjusts its sensitivity during the initial scan to tune out adjacent signal bleed, delivering clear visual LED indicators and explicit audible alert tones the exact millisecond it passes over the correct breaker module. Additionally, the transmitter incorporates a full 3-wire receptacle tester with a dedicated GFCI test button, allowing you to instantly diagnose open grounds, reversed wires, and faulty safety trips before removing any panel covers.

Why the Klein Tools® ET310 Digital Breaker Mapping System Controls the Panel:

• Pinpoint Microprocessor Calibration: Smart microprocessor automatically dials down signal sensitivity to ignore background cross-talk, singling out the exact target breaker module with absolute precision.
• Integrated 2-in-1 GFCI Receptacle Tester: Plugs directly into standard 3-wire outlets to instantly identify common wiring faults while featuring an official push-button ground fault trip check.
• Hassle-Free Visual & Audible Alerts: Combines a brilliant flashing green-to-red LED arrow indicator with a clear, high-pitch acoustic buzzer to signal an accurate circuit lock.
• Completely Safe Non-Invasive Mapping: Connects externally to active, energized circuits without tripping upstream breakers or shutting down sensitive office electronics during tracing.
• Rugged 6.6-Foot Drop-Tested Chassis: Forged inside a high-impact, trade-tested orange composite housing designed to shrug off rough jobsite drops onto solid concrete subfloors.

Specifications