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LightKeeper Pro

Model # 1203-CD

Internet # 100686478

Light Tester

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

$19.98 /each



Model # 1203-CD

Internet # 100686478

The LightKeeper Pro fixes most light sets and pre-lit trees in seconds. It finds the damaged bulb at the plug or at the bulb socket. The audible continuity detector pinpoints the problem by tracing the circuit to the point of interruption. Use the attached LED headlight to guide your way and let the 3-way bulb puller gets tight bulbs out with ease. Features a handy storage compartment built into the handle for housing your bulbs and fuses.

  • Quick-fix trigger fixes internal bulb failure
  • Features a voltage detector
  • Tests bulbs and fuses
  • LED headlight aids visibility for easy repair
  • Note: Product may vary by store

Info & Guides

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Assembled Depth (in.) 
4.75 in 
Assembled Height (in.) 
1.25 in 
Assembled Width (in.) 
7.00 in 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Commercial / Residential 
Commercial / Residential 
Holiday Decor Product Type 
Light Repair 
Product category 
Light repair tool 


Rated 4.3 out of 5 by 271 reviewers.
Rated 5.0 out of 5.0 by The tool repaired a bad section of my pre-lit tree! I found out about this tool by searching for "troubleshoot Christmas tree lights." I saw many hits about it and watched a couple YouTube videos (which I recommend to learn how to use it). I was amazed that it fixed a non-working section of my pre-lit tree on the first attempt! I had to go to three different stores to find one locally, and finally found them at Home Depot. December 8, 2014
Rated 5.0 out of 5.0 by The story of old Buck I had heard of this for some time, but never really had the need for one until this Christmas. I have an animated lit Buck that stands about 3 ft high and 4 ft long. I got old Buck 3 Christmases ago at HD and is a beauty when lit up, and unfortunately this year just before bringing him in for storage for another year, he blew out one whole leg, an entire side and part of the other side. Now let me say there are a heck of a lot of lights on old Buck. So I looked online and found they had this light keeper on clearance and in stock at my local Home Depot. Drove over and picked up two, since they were only 5 dollars each. Just in case one was a dud. It is multifaceted and tests the bulbs, will allegedly start up a string in some cases (I haven't tried this part yet) , and will hum to let you know where electricity stops at in a string. I plugged in old Buck and began scanning and it stopped humming pretty quick at the start of the outage area and didn't start humming again along about 30 of the bulbs, but restarted at the end. I replaced the first bulb after the last hum, nothing. I began pulling and testing the other bulbs along the string, most of which were truly out, some were not. But I still couldn't get Buck to light up in that area. At least the light checker told me which bulbs were out by pulling each and testing individually. I decided to take my time and just try a few a day, changing out as needed, so I wouldn't get frustrated and just shoot old Buck. Every time I would scan, it would still point to that first dud bulb which I had tested and replaced twice. Began taping the replaced bulbs with painters tape so I could tell where I had been. So today I scanned and replaced a few more bulbs and as it turns out, the place where the light checker had kept telling me was the start of the problem never has lit up, but I replaced another bulb on the line that was lose in its socket which was apparently causing the whole area to black out. Buck is up and fully functional again, so I can say this item does what it says it will do by narrowing down where your issue is. I got power humming everywhere but along his leg, which was a big help. I also found that some of the 2.5 replacement bulbs don't have enough wire to make contact in the socket, so I used some of the newer replacement bulbs that came in the 2 by 10 ft net lighting which solved that issue. That may be why that one bulb isn't lighting up, but I am not about to touch anything right now. My beloved Buck is up and running again and that is all I wanted. January 3, 2015
Rated 5.0 out of 5.0 by A Christmas Miracle What would have taken me hours in the past was cut to minutes with this tool. In the past it would be me and a volt meter going bulb by bulb trying to figure out why large sections of my pre lit tree would not it is done in just minutes....make sure after the lights come back on you replace any dead ones or you will have more go out November 28, 2014
Rated 5.0 out of 5.0 by Saving grace I never write reviews but this item warrants one! Been using it for years now. I've purchased them for friends and family, I've posted about it on Facebook. It has saved many prelit trees (mine as well as friends who have borrowed it), outdoor lights, prelit garlands, and numerous decorations. Totally worth it! If you follow the directions you can't go wrong. If your lights still don't work, then they just can't be fixed. This products will fix what can be fixed, but It can't fix something that is beyond repair. November 30, 2014
Rated 5.0 out of 5.0 by Paid for it's self with first use! We tested the string of lights and they worked......After staple gunning to the roof line they stopped working? Got the light tester out and read the instructions and used it.............Low and behold they started working. This thing will always be part of my Christmas decoration kit. Well worth the money! December 30, 2014
Rated 5.0 out of 5.0 by Best $20 i ever spent. Well worth the money. Not totally sure how it all works but I have a prelit tree and four of the strands were only partially lit. I was prepared to just add new lights when i found this on line. I got in the car a drove to the store immediately. I had every strand but one working in less than five minutes. The one strand i still ended up going bulb by bulb to find the bad connection. The voltage detector was hard to use on the prewired tree because all the wires are so close together. One other suggestion would be to pick up extra bulbs while you are at the store to replace any that are bad. I can see using it for other low voltage projects too. December 3, 2013
Rated 5.0 out of 5.0 by This is a must for all your indoor&outdoor holiday lights Worked great found the problem first thing . Was easy to used. You got to get one!!! November 12, 2013
Rated 5.0 out of 5.0 by This thing is amazing We bought this during the after Christmas sale 3 years ago. It took me 2 years to fully understand how this thing works but it definitely does work. If you have a string that is not working just pull a bulb out and plug the socket into the spot provided on the tester and pull trigger repeatedly until the lights come on. If the string of lights are divided into sections make sure you unplug one of the bulbs that is in the non working section. Make sure the string is plugged in while doing this. November 30, 2014
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