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

$41.37 / each


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
  • Home Depot Protection Plan:

    Home Depot Protection Plan

Info & Guides

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Assembled Depth (in.) 
1.3 in 
Assembled Height (in.) 
10.5 in 
Assembled Width (in.) 
6.3 in 
Product Depth (in.) 
0.9 in 
Product Height (in.) 
6 in 
Product Width (in.) 
1.9 in 
Batteries Included 
Battery Charger Included 
Battery Power Type 
Battery Size 
Case Included 
Control Type 
Data Log/Record 
Data hold 
Display Type 
Low Battery Indicator 
Number of Batteries Required 
Product Weight (lb.) 
0.2 lb 
Reference Scale Included 
Test Meter Type 
Other Meter/Tester 
Tools Product Type 
Test Meter 
Warranty / Certifications
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. 


Rated 3.5 out of 5 by 67 reviewers.
Rated 1.0 out of 5.0 by My experience I bought this tool but was very unhappy. The tool is annoying to use because you have to keep going through the learning mode to use it. The results were not always accurate and sometimes responded to more than one breaker. This tool has good promise but needs more work. I will be returning mine. April 8, 2015
Rated 5.0 out of 5.0 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 4.0 out of 5.0 by very useful but over priced This is a very useful tool If you need to track down a breaker with out having to walk back and forward to the panel to see if you shut off the circuit. Perfect when working alone. very accurate, iteven works with tandem breakers. The only down side is the price. I purchased the harbor freight brand circuit finder as well as a cheap knock off brand. They all looked similar on the outside except for the color and brand on the sticker. Also the Klein had a rubber grip. I took all three apart to compare them and found out they were all exactly the same product. Every chip and all the parts are the same no difference at all. They all functioned with the same quality as the Klein for half the price the only difference in what you pay for is the sticker that says Kleina free battery inincluded and the rubber grip. April 8, 2015
Rated 4.0 out of 5.0 by Works great, once you understand some limitiations At first I was very disappointed with the product because I couldn't get it to work at all. After searching online, I found that it will not work properly on circuits that have power strips with surge protection plugged in to them. At my current house, almost all of my circuits have one of these power strips so it was pretty useless, without unplugging everything. However, I just purchased a new to me house that doesn't have anything plugged in. My wife and I were able to map every outlet and switch on the 35+ circuits in about 2 hours and it was extremely accurate. The other important things to note are to hit the button to turn it on (do not hold the button in), run the scanner over all breakers once (ignore any beeps), then run it over the breakers one more time and it should only beep when on the correct breaker. In between each scan, I held down the power button to turn it off. Not sure if it is required to do this or not. On a few occasions, it beeped in between two breakers but one of the two was always the correct one. Saved us a ton of time on mapping my circuits. Once I had it figured out, I showed my wife once and it worked perfectly for her as well. February 17, 2015
Rated 5.0 out of 5.0 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 5.0 out of 5.0 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 5.0 out of 5.0 by great product at a great price This product did every thing that I expected it to do. January 9, 2015
Rated 3.0 out of 5.0 by Works as described. I work in refrigeration, picked this and the accesory kit up to help find the breaker for a fan circuit I needed to work on. There were six breaker boxes I had to scan, and found out through trial and error that the scanner needs to be reset between panels, this was not stated in the instructions or I would rate it four stars. If this would also work on 208-230v I could see it being a very valuable tool to me, 120v will limit its usefulness in my field but I think I will be glad to have it on my truck. November 7, 2011
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