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The Klein Tools ET310 Circuit Breaker Finder with Integrated GFCI Outlet Tester is a digital circuit breaker finder used to locate the correct circuit breaker in a panel to which an electrical outlet or fixture is connected. The Transmitter is connected to the electrical outlet or fixture in the circuit while the receiver is used to scan the breakers in the circuit panel. The Transmitter also features a GFCI outlet tester.

Product Depth (in.) | 1.39 in |
|---|---|
Product Width (in.) | 2.16 in |
Category Rating | II |
|---|---|
Features | Audible Alert |
Included | Batteries |
Power Source | Battery Operated |
Returnable | 90-Day |
Test Meter Type | Circuit Breaker Finder |
Certifications and Listings | No Certifications or Listings |
|---|---|
Manufacturer Warranty | Please refer to the attached warranty document in the Product Overview section above under Info & Guides. |
The Klein Tools Cat. No. ET310, Digital Circuit Breaker Finder with GFCI Outlet Tester, is designed to locate the breaker supplying an energized 90–120V AC circuit. For assistance identifying individual circuits within a tandem breaker, please contact customerservice@kleintools.com.
The Klein Tools Cat. No. ET310, Digital Circuit Breaker Finder with GFCI Outlet Tester, identifies the breaker supplying an energized 90–120V AC outlet, providing audible and visual indications when the correct breaker is located. It is not designed for general-purpose wire toning or tracing wire paths through walls.
Klein Tools Cat. No. ET310, Digital Circuit Breaker Finder with GFCI Outlet Tester, has wiring-condition indicators that show whether the outlet is energized and identify common wiring faults, including an open hot condition.
No. The Klein Tools Cat. No. ET310, Digital Circuit Breaker Finder with GFCI Outlet Tester, is designed to locate the correct circuit breaker for an energized outlet or fixture and to test outlet wiring conditions and GFCI devices. It is not designed to locate or diagnose a break in a power line between the breaker and an appliance.
No. The Klein Tools Cat. No. ET310, Digital Circuit Breaker Finder with GFCI Outlet Tester is designed to locate circuit breakers and test outlet wiring/GFCI devices. It does not function as a voltage detector for identifying voltage in individual wires.
The Klein Tools Cat. No. 32500, Multi‑Bit Screwdriver/Nut Driver, 11‑in‑1, with Phillips, Slotted, Square, and TORX® bits, is not magnetic. If you need a magnetic version of this tool, consider the Klein Tools Cat. No. 32500MAG, the 11‑in‑1 Magnetic Screwdriver/Nut Driver.
Yes, the Klein Tools CAT No. ET310, Digital Circuit Breaker Finder with GFCI Outlet Tester, can be used in a two‑story home, even when the panel box is downstairs and the outlets are upstairs. The tool is designed to trace wiring through walls, circuits, and across floors, so distance between levels typically isn’t an issue. Performance may vary depending on wiring layout, building materials, and electrical interference. For best results, ensure the circuit is energized and follow the included instructions for signal strength adjustment.
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