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tunabreath 43.7K Views
Jan 26, 2026 9:18 PM

Fluke BK120 SmartTrace Breaker Finder & Socket Tester

$59

$80

26% off
+ Free Shippingat Amazon
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Update: This popular deal is still available.

Amazon has Fluke BK120 SmartTrace Breaker Finder & Socket Tester for $59. Shipping is free.

Home Depot also has Fluke BK120 SmartTrace Breaker Finder & Socket Tester for $59. Shipping is free. Otherwise, select ship to store pick up where available.

Thanks to Community Member tunabreath for finding this deal.

Product Description:
  • Stop the guesswork, ensure safety, and save time with the BK120 - your one-stop shop for effortless circuit identification and voltage detection. The BK120 is a versatile tool designed for electricians, homeowners, and maintenance professionals. This user-friendly system streamlines electrical work, circuit tracing, and troubleshooting, making it an essential addition to any toolbox.
  • Locate the correct breaker quickly and accurately
  • Built-in GFCI Tester
  • Low battery indicator
  • Conserve battery life with auto sleep mode
  • Illuminate your workspace for clear visibility in low-light environments
  • CAT III 150 V safety rated

Editor's Notes

Written by megakimcheelove | Staff
  • About this Deal:
    • Our research indicates that this is $18.79 lower (24.2% savings) than the next best available price from a reputable merchant with prices starting from $77.79 at the time of this post.
    • While supplies / offer lasts.
    • Please see the original post for additional details and give the WIKI and forum comments a read for helpful discussion.
  • About this Store:

Original Post

Written by tunabreath
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.

Amazon has Fluke BK120 SmartTrace Breaker Finder & Socket Tester for $59. Shipping is free.

Home Depot also has Fluke BK120 SmartTrace Breaker Finder & Socket Tester for $59. Shipping is free. Otherwise, select ship to store pick up where available.

Thanks to Community Member tunabreath for finding this deal.

Product Description:
  • Stop the guesswork, ensure safety, and save time with the BK120 - your one-stop shop for effortless circuit identification and voltage detection. The BK120 is a versatile tool designed for electricians, homeowners, and maintenance professionals. This user-friendly system streamlines electrical work, circuit tracing, and troubleshooting, making it an essential addition to any toolbox.
  • Locate the correct breaker quickly and accurately
  • Built-in GFCI Tester
  • Low battery indicator
  • Conserve battery life with auto sleep mode
  • Illuminate your workspace for clear visibility in low-light environments
  • CAT III 150 V safety rated

Editor's Notes

Written by megakimcheelove | Staff
  • About this Deal:
    • Our research indicates that this is $18.79 lower (24.2% savings) than the next best available price from a reputable merchant with prices starting from $77.79 at the time of this post.
    • While supplies / offer lasts.
    • Please see the original post for additional details and give the WIKI and forum comments a read for helpful discussion.
  • About this Store:

Original Post

Written by tunabreath

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Top Comments

Ekeenan86
885Comments
68Reputation
Very mixed reviews on this, may depend on the panel type or how it's wired. Going with Home Depot on this deal as the return policy is much better than Amazon.
Go to Comment
FuschiaCaribou204
140Comments
18Reputation
i have the klein one for about this price range. is this one much better? With the klein i've had issues not being able to find the breaker. it would just ring at multiple breakers.
Go to Comment

Community Reviews

The Fluke BK120 is a breaker finder and socket tester that stands out for clearer, more reliable tracing than cheaper Klein and Harbor Freight alternatives. It can narrow down the correct breaker, works well on mislabeled circuits, and also doubles as a non contact voltage detector. The kit is easier to use when the panel is not a wiring mess, and accessory adapters can help with light sockets or alligator clip connections. The main caution is that breaker tracing is not exact, so panel type and wiring can affect results and verification is still needed.

Common Questions (5)

AI-generated summary based on comments from the community. Updated ago

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64 Comments

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Jan 28, 2026 4:21 PM
11.4K Comments
Joined Dec 2008
steppedinitJan 28, 2026 4:21 PM
11.4K Comments
Quote from eeagle View quoted comment :
So how would you use this to change out a dimmer switch?
You have to do it the old fashioned way. Turn the light on, then have someone else flip the breakers until you find the right one.

I have the same issue with an outdoors light I want to replace.
Jan 28, 2026 4:51 PM
2.9K Comments
Joined May 2007
eeagleJan 28, 2026 4:51 PM
2.9K Comments
Quote from steppedinit View quoted comment :
You have to do it the old fashioned way. Turn the light on, then have someone else flip the breakers until you find the right one.

I have the same issue with an outdoors light I want to replace.
Thanks, but that is the reason I need to change out the switch, the light not longer comes on, so guess I need to check for voltage at the switch and see which breaker stops the power. I was hoping there was an easier way to find the breaker w/o all the breaker flipping. Oh and to make matters harder it is a 3 way switch.
Jan 28, 2026 5:26 PM
3.3K Comments
Joined Sep 2011
E4300Jan 28, 2026 5:26 PM
3.3K Comments
Quote from Ekeenan86 View quoted comment :
Very mixed reviews on this, may depend on the panel type or how it's wired. Going with Home Depot on this deal as the return policy is much better than Amazon.
This technology is not 100% reliable. Idiot proof/dirt cheap option is to energize only one breaker at a time (do not connect more than one black wire to each breaker) and check for 120 VAC using cheap/free Harbor Freight multimeter at the outlet(s) inside the home. Label the outlets controlled by this breaker.

I've seen homes with two or more black wires connected to one breaker. Sometimes, a single breaker can control different AC outlets in different rooms.
Jan 28, 2026 5:35 PM
3.3K Comments
Joined Sep 2011
E4300Jan 28, 2026 5:35 PM
3.3K Comments
Quote from 1-6 View quoted comment :
Great for figuring out who's stealing your power.
Easiest way is to switch off all the AC breakers going into your house and watch the power meter. If the meter is rotating or shows more than 0.1 watts, then someone is pulling power somewhere between the power meter and your AC breaker box.

In theory the power that you use should be controlled by a breaker located in the breaker box.
1
Jan 29, 2026 3:23 PM
203 Comments
Joined Oct 2007
monockJan 29, 2026 3:23 PM
203 Comments
Fluke tool at a decent price
Jan 29, 2026 10:30 PM
194 Comments
Joined Mar 2021
BraveFog2937Jan 29, 2026 10:30 PM
194 Comments
Wow, I didn't know this was a thing. Too bad it's 50/50 on this thing actually working from the comments and reviews. Meh, never knew I had a problem before knowing about this product so... I'm good.
1
1
Jan 30, 2026 2:15 AM
526 Comments
Joined Aug 2008
jonlee107Jan 30, 2026 2:15 AM
526 Comments
Quote from BraveFog2937 View quoted comment :
Wow, I didn't know this was a thing. Too bad it's 50/50 on this thing actually working from the comments and reviews. Meh, never knew I had a problem before knowing about this product so... I'm good.
Thanks for reading the comments and reviews

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Feb 1, 2026 7:31 PM
214 Comments
Joined Nov 2020
FairSoda312Feb 1, 2026 7:31 PM
214 Comments
make testing and documenting circuits easier
Feb 3, 2026 5:54 PM
112 Comments
Joined Nov 2016
doubleedgedpenFeb 3, 2026 5:54 PM
112 Comments
Quote from eeagle View quoted comment :

Thanks, but that is the reason I need to change out the switch, the light not longer comes on, so guess I need to check for voltage at the switch and see which breaker stops the power. I was hoping there was an easier way to find the breaker w/o all the breaker flipping. Oh and to make matters harder it is a 3 way switch.
They make "Breaker Finder Accessory Kit" sets, which let you attach the transmitter to the wires with alligator clips.
Pro
Deal Editor
Feb 3, 2026 9:44 PM
18.4K Comments
Joined May 2008
powerfuldopplerFeb 3, 2026 9:44 PM
Pro
Deal Editor
18.4K Comments
Update: This popular deal is still available.
1
Feb 3, 2026 10:07 PM
856 Comments
Joined Mar 2011
MeAmSupermanFeb 3, 2026 10:07 PM
856 Comments
I just got the AstroAI version for $40 which I haven't opened up yet. Shame that Klein and Fluke don't include accessories like bulb socket adapter, 3-to-2 plug and alligator clips. I've had a fluke cable toner before and although it worked well, so did some of the other brands I tried. Let's see how AstroAI plays out.
Feb 3, 2026 11:09 PM
3.2K Comments
Joined Nov 2010
smarttFeb 3, 2026 11:09 PM
3.2K Comments
Quote from 1-6 View quoted comment :
Great for figuring out who's stealing your power.
How do people steal power? Are you in some kind of shared housing? Also, how would you figure out who is stealing? If you can't figure that out, then you have no idea where to put the transmitter.
Last edited by smartt February 3, 2026 at 03:17 PM.
1
Feb 3, 2026 11:12 PM
3.2K Comments
Joined Nov 2010
smarttFeb 3, 2026 11:12 PM
3.2K Comments
Quote from MeAmSuperman View quoted comment :
I just got the AstroAI version for $40 which I haven't opened up yet. Shame that Klein and Fluke don't include accessories like bulb socket adapter, 3-to-2 plug and alligator clips. I've had a fluke cable toner before and although it worked well, so did some of the other brands I tried. Let's see how AstroAI plays out.
I'd be curious how well it worked because that model on Amazon has all the accessories you mentioned. Suppose if the Fluke worked well, a power adapter to a light socket, can't be too much.

Edit: Actually only $3 for outlet adapter at HD: https://www.homedepot.com/pep/Lev.../100357036
Last edited by smartt February 3, 2026 at 03:16 PM.
Feb 3, 2026 11:57 PM
5.1K Comments
Joined Jun 2008
AndrewinMDFeb 3, 2026 11:57 PM
5.1K Comments
Amazon reviews are more favorable than the HD ones overall. I have such weird wiring in this place -- receptacles on the 3rd floor connected to ones in the basement -- that I'm giving it a shot. Any time I need to find a circuit breaker for an outlet, it takes 4-6 breakers before I find the correct one, and I've tried to label them over the last 6 years. Hopefully this can save me some time as I need to swap out 4 outlets that escaped the "great upgrade" a few years ago.
Ordered through AAFES and got it for $53.10 shipped. Even better.
Last edited by AndrewinMD February 3, 2026 at 04:02 PM.

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Feb 4, 2026 12:20 AM
1.7K Comments
Joined Nov 2006
sidewinder33625Feb 4, 2026 12:20 AM
1.7K Comments
how often do you check breakers to need something like this?

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