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Klein Tools ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester

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The Klein Tools ET310 Digital Circuit Breaker Finder with Integrated GFCI Outlet Tester is a circuit breaker tester used to locate the correct circuit breaker in a panel to which an electrical outlet or fixture is connected. The ET310 Klein Tools 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 Klein ET310 is very commonly used by HVAC technicians as an AC circuit breaker finder (circuit tester/breaker tester). The klein circuit breaker finder also features a GFCI tester for outlets or a digital plug tester.


  • (1) Klein Tools ET310 Digital Circuit Breaker Finder with GFCI Outlet Tester
  • (1) Transmitter
  • (1) Receiver
  • (1) User Manual
  • (1) 9V battery


  • Klein circuit breaker finder is quick and accurate at locating the correct circuit breaker corresponding to an electrical outlet or fixture
  • Consists of two parts: a Transmitter connected to the electrical outlet or fixture, and a Receiver used to scan the circuit breaker panel
  • Receiver delivers clear visual and audible indications when the correct breaker has been located
  • Operates on 90-120V AC circuits
  • Transmitter incorporates a GFCI outlet tester to inspect the wiring condition at the electrical outlet and test GFCI devices
  • Transmitter docks in the Receiver for convenient storage as a single item when tester is not is use
  • Transmitter incorporates a three-pin plug for connecting to North-American-style grounded electrical outlets
  • The transmitter may be connected to other electrical fixtures using optional accessories (sold separately))
  • Receiver powers off automatically after approximately three minutes of non-use to conserve battery life
  • Low battery indicator
  • Easily accessible battery compartment. Uses one 9V battery in receiver only; Transmitter does not require a battery
  • Transmitter is powered by the circuit when connected to the electrical outlet or fixture
  • Built to withstand a 6.6-Foot (2 m) drop
  • CAT II 120V safety rating


Type : Electronic Tester
Application : Locate Circuit Breakers in Panel, Test GFCI Devices
Special Features : Transmitter docks in Receiver Transmitter integrated GFCI outlet tester in receiver
Overall Length : 10.96'' (27.8 cm) (With Transmitter docked in Receiver)
Overall Height : 2.16'' (5.5 cm) (With Transmitter docked in Receiver)
Overall Width : 1.39'' (3.5 cm) (With Transmitter docked in Receiver)
Material : PC & PC-ABS housing and electronic components
Standard : CATII 120V
Included : Includes Transmitter, Receiver, user manual, and 9V battery for Receiver
Weight : 7.2 oz. (204 g)
UPC : 092644692406


Q & A

How do i use the Klein ET310?

To use the Klein Tools ET310: Turn on transmitter and insert into outlet or socket. Turn on Receiver. Go to circuit breaker panel and pass the receiver gently over the panel once to calibrate it. Pass it a second time to locate breaker. The light turns red on receiver when located. It will also make an faster beeping sound when you have found the correct breaker. More detailed instructions can be found in the user manual.

Do klein tools have a lifetime warranty?

Klein Tools offers two distinct warranties depending on product type. In this case, it would be:

Limited Warranty

Klein Tools, Inc. warrants that the products set forth below will be free from defects in material and workmanship, under normal use for the timeframes listed below (unless otherwise noted on the product packaging). At its option, Klein Tools will repair or replace, or refund the purchase price of, any product which fails to conform with this warranty. This warranty does not apply to damage from alterations, abuse, misuse, lack of maintenance, or normal wear and tear of the product. Proof of purchase from an Authorized Klein Tools Distributor is required for all warranty claims. This warranty does not apply to batteries.

Electrical Test and Measurement Tools are warrantied for two years from the date of purchase. This warranty explicitly does not cover High Voltage Test and Measurement Tools. See Klein Commercial and Industrial products warranty.

Warranty Returns

All warranty returns require proof of purchase from an Authorized Klein Tools Distributor and must include a Warranty Return Authorization (WRA) number.

Customer Reviews

Based on 1 review
Must have for every home

Works very well unless the wiring inside the panel isn't well laid out. Also slow down, don't go to fast over panel.