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Klein Tools ET310

Klein Tools ET310 digital circuit breaker finder with its transmitter and receiver docked together

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ET310 finder only

Type:
Electronic tester: digital circuit breaker finder
Application:
Locates circuit breakers in a panel; tests GFCI devices
How it works:
The transmitter plugs into the outlet or fixture; the receiver scans the breakers in the panel to find the matching circuit

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Package details

Model: ET310

Transmitter, receiver, 9V battery and manual, no case or accessory kit.

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing
Included essentials:
Transmitter, receiver, user manual, 9V battery

Important limit: 120V AC indoor systems only; do not connect it to higher-voltage supplies

Confirm condition, quantity and included accessories on the retailer’s listing.

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Specifications checked November 5, 2026. Full product details

Size and package

Size and placement

Size
10.96 x 2.16 x 1.39 in (27.8 x 5.5 x 3.5 cm)
Weight
7.2 oz (204 g)

In the box

Transmitter, receiver, user manual, 9V battery

Manufacturer specifications

Klein Tools ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester

A plug-in digital circuit breaker finder that identifies the breaker feeding an outlet, with a receiver you scan the panel with and a transmitter that doubles as a GFCI outlet tester.

Which version should you buy?

Selected package: ET310 finder only.

Bundles and accessories

  • ET310 finder onlyModel: ET310

    Contents and availability

    Transmitter, receiver, 9V battery and manual, no case or accessory kit.

  • ET310KIT kitModel: ET310KIT

    Contents and availability

    Adds the breaker-finder accessory kit.

Related models and generations

These are different products. Check their specifications separately.

  • ET310CASE Model: ET310CASE

    A replacement case for the ET310.

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • ET310 alone is the finder; a listing with accessories is the ET310KIT.

Why people pick it

  • Finds the right breaker from the outlet end, without trial-and-error flipping or a second person
  • The transmitter is also a GFCI outlet tester, so one gadget covers the outlet-side checks
  • The transmitter docks in the receiver, so the pair stays together in a drawer
  • Runs on one common 9V battery that ships with it

Know before you buy

  • 120V AC indoor systems only; do not connect it to higher-voltage supplies
  • Klein publishes no auto-sensitivity or depth figure; scanning a crowded panel takes a slow pass
  • Klein's catalog lists no accessories for bare-wire tracing included in the box (the 69411 accessory kit is separate)
  • Not a wire tracer for dead-circuit routing; it identifies the breaker an energized outlet is on

Full specifications

TypeElectronic tester: digital circuit breaker finder
ApplicationLocates circuit breakers in a panel; tests GFCI devices
How it worksThe transmitter plugs into the outlet or fixture; the receiver scans the breakers in the panel to find the matching circuit
TransmitterIntegrated GFCI outlet tester; docks in the receiver for storage
Safety ratingCAT II 120V
VoltageFor 120V AC electrical systems, indoor use only
Batteries1 x 9V (included for the receiver)
MaterialPC and PC-ABS housing with electronic components
IncludedTransmitter, receiver, user manual, 9V battery
Size10.96 x 2.16 x 1.39 in (27.8 x 5.5 x 3.5 cm)
Weight7.2 oz (204 g)

From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.

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