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Two-piece circuit breaker finder with transmitter and receiver, yellow plastic housing, three-pin plug on transmitter

Klein Tools ET310 AC Circuit Breaker Finder with GFCI Outlet Tester

SKU CH-G3K6-9AW1R

Locates the correct circuit breaker on 90-120V AC panels and tests GFCI outlets with a dockable transmitter and receiver set

  • Team affiliation1 Piece
  • Key featuresIncludes Transmitter, Receiver, user manual, and 9 V battery
  • Overall height10.96 L x 2.16 W x 1.39 H inches
  • Overall width10.96 L x 2.16 W x 1.39 H inches
  • Overall length10.96 L x 2.16 W x 1.39 H inches
  • Product weight7.2 oz
  • Locate the right breaker fast with visual and audible alerts
  • Two-part transmitter and receiver system enables precise panel scanning
  • Built-in GFCI outlet tester checks wiring and safety devices
  • Transmitter docks inside receiver for compact 7.2 oz storage
  • Works on 90-120V AC circuits with North-American three-pin plug

Circuit Breaker Finder for Electricians

The Klein Tools ET310 is a two-part system built for electricians and maintenance technicians who need to match outlets to breakers quickly. A transmitter plugs into a North-American grounded outlet while a handheld receiver scans the panel. The transmitter also integrates a GFCI outlet tester to verify wiring conditions before work begins.

Steady Scanning Across 90-120V AC Panels

The receiver delivers consistent visual and audible signals while moving across live breakers in the 90-120V AC range, so identification remains reliable during a full panel sweep rather than a single quick check. Battery-powered operation keeps the tool ready without mains leads, and the docked storage prevents lost parts between jobs.

Plug-In Transmitter Docks for Compact Storage

Installation is a matter of plugging the three-pin transmitter into the target outlet and sweeping the receiver; no wiring or configuration is required. The transmitter nests inside the receiver when not in use, keeping the 7.2-ounce kit together in a tool bag. Users without standard grounded outlets will need an adapter not included in the package.

How it compares

Measured against everything we stock in Multimeters & Electrical Testers, at today’s prices. Recalculated every night.

Price $58.99
Pricier than about 81% of the 971 comparable items (median $30.99).

Specifications

Product
Brand nameKLEIN TOOLS, Klein Tools
Product typeVoltmeter and Ohmmeter
Size & build
Overall height10.96 L x 2.16 W x 1.39 H inches
Overall width10.96 L x 2.16 W x 1.39 H inches
Overall length10.96 L x 2.16 W x 1.39 H inches
Product weight7.2 oz
More details
Team affiliation1 Piece

Questions about this item

Does the ET310 generate any noise or heat while scanning a panel all day?

The receiver gives visual and audible signals when it detects the correct breaker, and the transmitter draws power only from the 90-120 V AC circuit it is plugged into.

What must I already have on site for the ET310 to operate?

A North-American-style grounded outlet or fixture on a 90-120 V AC circuit, plus the 9 V battery supplied for the receiver.

Can the ET310 identify breakers on older two-wire circuits without a ground pin?

The transmitter uses a three-pin plug for grounded outlets, so an ungrounded two-wire circuit cannot be tested directly with this unit.

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