Klein Tools Digital Circuit Breaker Finder-ET300 at The Home Depot

Klein Tools

Model # ET300

Internet # 202330830

Store SKU # 365518

Digital Circuit Breaker Finder

Klein Tools Digital Circuit Breaker Finder

This item has been discontinued.
The Home Depot no longer carries this specific product.

Was   $41.37
$29.97 / each

Save $11.40 (28%)



Model # ET300

Internet # 202330830

Store SKU # 365518

Quickly and accurately find the corresponding circuit breaker of 120-volt standard outlets with the Klein Tools Digital Circuit Breaker Finder. Featuring an LED display, this circuit breaker finder has an arrow that flashes for easy identification and a transmitter that reaches distances of up to 1,000 ft. The included 9-volt battery features a long life thanks to the automatic shut off.

  • Finds the corresponding circuit breaker of 120-volt standard outlets without interruption of service
  • Power can be left on for convenience
  • Strong transmitter reaches distances of up to 1,000 ft.
  • LED display and flashing arrow indicator for easy identification
  • Includes one 9-volt battery
  • Auto shutoff provides long battery life by conserving power
  • 90 - 120-volt operation

Info & Guides

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Assembled Depth (in.)  1.3 in  Assembled Height (in.)  10.5 in 
Assembled Width (in.)  6.3 in  Backlit  No 
Batteries Included  Yes  Battery Charger Included  No 
Battery Power Type  Alkaline  Battery Size  9-volt 
Control Type  Manual  Data Log/Record  No 
Data hold  No  Display Type  LED 
Low Battery Indicator  Yes  Manufacturer Warranty  This product is warranted to be free from defects in materials and workmanship for a period of two years from the date of purchase. This warranty does not cover damage which occurs in shipment or failure which results from alteration, tampering, accident, misuse, abuse, neglect, or improper maintenance. 
Measures/Detects  Voltage  Number of Batteries Required 
Product Depth (in.)  0.9 in  Product Height (in.)  6 in 
Product Weight (lb.)  0.2 lb  Product Width (in.)  1.9 in 
Reference Scale Included  No  Returnable  90-Day 
Test Meter Type  Other Meter/Tester 


Rated 3.3 out of 5 by 52 reviewers.
Rated 5 out of 5 by Worked great for me! Bought this and a Sperry (from another store) and tested both side by side, and this was way more accurate. If you follow the instructions which say to run it up and down the whole panel first (it gives some false positives initially), then it worked really accurately. Identified only the fuse in question usually or worst case, the one next to it, as well as the correct one. July 27, 2014
Rated 5 out of 5 by worked as promised I purchased this tool to trace a circuit so I could shut it off to replace a burned out exhaust fan. I have a commercial building and I didn't want to start trying to turn off breakers since some circuits were for servers and computers and testing equipment. A electrician friend said these testers don't work, and don't waste your money!. I bought it anyway At the same time I purchased the accessory kit with light socket adaptor and alligator clips. I attached the alligator clips to the live wires and went to the panel and the tester went off when I went over 2 circuit breakers. Of Course, neither were labelled! I turned one off and it didn't kill the power. In turned the other off and it was the right one. This saved me a lot of headaches. I would recommend this tester. September 29, 2014
Rated 5 out of 5 by Circuit tracing made easy Perfect for when you are doing electrical work on your home and need to find a lost, unknown electrical circuit. June 7, 2014
Rated 1 out of 5 by Didn't work on old house with BX wiring. Indications were simply incorrect. Perhaps there was crosstalk between the circuits due to the BX sheathing on the house wiring. Whatever the cause, the wrong CB's were tagged by the device. I had to resort to the old brute-force method of detection. I'd made my own test cable with alligator clips to connect to bare wires in the wall box, too, so I would've saved time and money by skipping this circuit breaker non-finder altogether. Also, I didn't see an easy way to change batteries. November 19, 2014
Rated 1 out of 5 by Failed almost immediately Unit "learning mode" worked the first time - in conjunction with the transmitter it then correctly identified the circuit being tested. The unit was then turned off and put back in "learning mode" to do another test - at that point it did not recognize anything on the breaker panel. Repeated attempts were made, about 1 in every 5 tries I got one random beep. I did around 20 retries. It would not learn the panel. I swapped out the OEM battery for a brand-new 9V battery but that made no difference. I've put the OEM battery back in and I'm taking this unit back for a refund. The unit itself was well-made but the functionality for this specific example was nil after the very first use. I rated it as poor in both quality and value as my unit failed to work any more. November 12, 2014
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