Description
Klein ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester
Fast, Accurate Circuit Identification + Essential GFCI Protection Testing
The Klein Tools ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester is a must-have tool for electricians, HVAC techs, maintenance workers, inspectors, and homeowners. Designed to quickly and accurately locate the correct circuit breaker powering any 120V AC standard outlet, the ET310 eliminates guesswork and speeds up electrical diagnostics.
With its built-in GFCI outlet tester, bright visual indicators, and a strong transmitter/receiver pairing system, this tool streamlines troubleshooting, circuit tracing, and safety checks on residential and commercial electrical systems. Rugged construction and simple operation make the ET310 a jobsite favorite.
Features & Benefits
✔ Fast & Accurate Circuit Breaker Identification
Digitally pinpoints the correct breaker governing any 120V AC outlet—no more trial-and-error shutdowns.
✔ Includes GFCI Outlet Tester
Tests GFCI receptacle operation and wiring conditions, helping identify:
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Open ground
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Open neutral
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Open hot
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Hot/ground reverse
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Hot/neutral reverse
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Correct wiring
✔ Strong, Reliable Transmitter + Receiver System
The transmitter plugs into any standard outlet; the receiver scans breaker panels to identify the correct circuit.
✔ Audible + Visual Confirmation
The receiver provides a clear signal with beeps and bright indicators when the correct breaker is found.
✔ Works on Energized Circuits
Trace and identify circuits safely without interrupting power.
✔ Auto Power-Off
Extends battery life with automatic shutoff when inactive.
✔ Rugged Jobsite Build
Impact-resistant housing designed for professional field environments.
✔ Simple, Intuitive Operation
No complicated settings—plug in, scan, identify.
Specifications
| Specification | Detail |
|---|---|
| Brand | Klein Tools |
| Model | ET310 |
| Function | Digital circuit breaker finder + GFCI tester |
| Voltage Range | 120V AC standard outlets |
| Indicators | Audible tone + visual LED indication |
| GFCI Testing | Yes – built-in push-to-test function |
| Power Source | 1x 9V battery (receiver) |
| Transmitter Plug Type | Standard NEMA 5-15 (120V) |
| Safety Rating | CAT II 120V |
| Use Case | Circuit identification, GFCI testing, outlet troubleshooting, electrical maintenance |
| Construction | Durable, impact-resistant housing |
| Typical Users | Electricians, maintenance techs, inspectors, HVAC, DIY homeowners |
FAQ – Frequently Asked Questions
1. Can the ET310 trace circuits without shutting off the power?
Yes. It identifies circuits on energized 120V AC lines—no power interruption required.
2. Does this tester work on lighting circuits or switches?
Direct testing requires an adapter, but the ET310 is primarily designed for outlet-based circuit tracing.
3. Can it test GFCI outlets?
Yes. The transmitter includes a built-in GFCI test button to verify proper operation.
4. Will it work on multi-story homes or long circuits?
Yes. The ET310 is strong enough for typical residential and light commercial distances.
5. Does the receiver light up if it detects the wrong breaker?
No. It only provides clear audible/visual feedback when the correct breaker is located.
6. Is the tool safe for beginners?
Yes. It’s simple to use and designed for both professionals and homeowners.
7. Does it need calibration?
No. The ET310 is factory calibrated and ready to use.
