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Ships from: Amazon Sold by: M Emporium
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Ships from: Amazon Sold by: Ulta-Lit Tree Company

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Ulta Lit Light Keeper PRO 01201 The Complete Tool for Fixing Miniature Light Sets
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Learn more
Return this item for free
We offer easy, convenient returns with at least one free return option: no shipping charges. All returns must comply with our returns policy.
Learn more about free returns.- Go to your orders and start the return
- Select your preferred free shipping option
- Drop off and leave!
Bundles with this item
Purchase options and add-ons
Brand | LIGHT KEEPER PRO |
Power Source | Battery Powered |
Style | DIY; environmentally conscious |
Color | Red |
Item Weight | 0.3 Pounds |
About this item
- LightKeeper Pro fixes most incandescent light sets in seconds with the squeeze of the trigger. LightKeeper Pro's Quick Fix Method repairs the #1 cause of light set failure known as a Shunt Issue (internal bulb failure).
- Great for Pre-Lit Trees, icicle light sets, net lights, wreaths, garland, and other pre-lit décor. Over 6 million LightKeeper Pro's sold!
- Includes Bulb Tester, Fuse Tester, Bulb Puller, Storage Compartment for spare bulbs & fuses, 10 clear replacement bulbs (2.5V, 170mA). Even includes Batteries (1.5 Volt Alkaline).
- Ulta-Lit Tree Company (the manufacturer) offers a Lifetime Warranty (excluding batteries & bulbs) on this item, testing to the highest standards to ensure that quality items arrive at your door. For more information, visit UltaLit.com.
Additional Details


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From the brand

LightKeeper Pro
Proudly keeping your Holidays bright for over 20 years.
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Can the LightKeeper Pro fix LEDs?
Due to the different physics behind incandescent and LED light sets, the LightKeeper Pro cannot assist with LED light sets. But thankfully, the company behind the LightKeeper Pro also offers the LED Keeper -- the complete kit to repair LED light sets!
How to tell if you are working with incandescents or LEDs?
a) Incandescent bulbs have filaments and tend to get warm when lit a while LEDs do not
b) Remove a bulb and look to see if the wires are offset or not [Offset = LED; Equal height = Incandescent]
c) LEDs have a plastic encasement while incandescent has glass
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What type of bulbs come with the LightKeeper Pro?
Non-flashing, Clear 2.5 volt Replacement bulbs, 170mA and 0.425 Watts.
Can this tool fix a strand where every other light is out?
The LightKeeper Pro can assist with incandescent light sets that are wired in series, meaning you can remove one bulb from a functional section and the section will become unlit. Typically, if every other bulb is out then we are dealing with a control box or a light set that is not wired in series. The LightKeeper Pro cannot assist with light sets that have control boxes, rope lights, battery operated sets, or LEDs.
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Why buy this for just a string of lights?
The LightKeeper Pro is great for pre-lit trees, icicle lights, net lights, wreaths, wire frames with lights, and other pre-lit décor!
Does this tool work with 220 Volts?
No, the LightKeeper Pro was designed for 120 Volts only. Thankfully, there is an International LightKeeper available which is designed to work with 220 Volts (outside the U.S.).
Product information
Brand | LIGHT KEEPER PRO |
---|---|
Power Source | Battery Powered |
Style | DIY; environmentally conscious |
Color | Red |
Item Weight | 0.3 Pounds |
Item dimensions L x W x H | 7.7 x 1.5 x 4.7 inches |
Min. Operating Voltage | 120 Volts |
Specification Met | UL |
Measurement Type | Inches, Pounds |
Maximum Operating Voltage | 120 Volts |
UPC | 798837826664 885391365019 301152656214 784642012019 885916959358 885325680911 794615116149 784642712018 989898312108 490511910538 |
Manufacturer | Ulta Lit Tree Company |
Global Trade Identification Number | 00784642012019 |
Product Dimensions | 7.7 x 1.5 x 4.7 inches |
Item Weight | 4.8 ounces |
Department | Unisex-Adult |
ASIN | B000R8KBOK |
Item model number | 1201-A2 |
Batteries | 3 LR44 batteries required. (included) |
Customer Reviews |
4.0 out of 5 stars |
Best Sellers Rank | #37,715 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #64 in Circuit Testers |
Is Discontinued By Manufacturer | No |
Assembly required | No |
Number of pieces | 1 |
Warranty Description | Lifetime warranty. |
Batteries required | Yes |
Included Components | LightKeeper Pro® Incandescent Light Set Repair Tool |
Import | Imported |
Warranty & Support
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Ulta Lit Light Keeper PRO 01201 The Complete Tool for Fixing Miniature Light Sets
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Videos
Videos for this product
1:12
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Customer Review: Does everything it claims it can do!Corie
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0:51
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Customer Review: Works like magic!John Kundert-gibbs
Videos for this product
0:36
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Customer Review: What kind of sorcery is this?!? 😲 🧙♂️Christian
Videos for this product
2:35
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It WORKS! Stop throwing away light strandsMelinda Donnell
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Is the LightKeeper Pro built poorly?...🔴Declan's Reviews🔴
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How To Use & Review of Lightkeeper ProThe Daily DIY
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How To Use The Light Keeper ProThe Gift Giving Guide
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How the LightKeeper Pro WorksLight Keeper
Product guides and documents
Customer reviews
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers say
Customers find the light tester to be a lifesaver, particularly for prelit Christmas trees, and appreciate its ability to test both bulbs and fuses. Moreover, the tool helps fix multiple light strings, including outdoor ones, and customers consider it worth the money. However, the functionality and ease of use receive mixed feedback - while some say it works like a charm and is straightforward to use, others report it doesn't work on LED sets and find the instructions difficult to understand. Additionally, the light level aspect shows mixed results, with some saying their tree is lit again while others report only half of the string lighting up.
AI-generated from the text of customer reviews
Customers find the light tester to be worth the purchase, as it has saved them money.
"...and effectiveness make it a reliable and cost-saving investment for holiday decorating enthusiasts...." Read more
"...This is a great product that does exactly what you want it to do, it gets the light string working so you can quickly find and replace the bad bulbs...." Read more
"...out why some strings no longer light up, as I do, it is more than worth the cost. True, it might not fix every string...." Read more
"...However, I can sum this product up in one word: USELESS!..." Read more
Customers find the light tester effective, helping them fix multiple strings of lights, including both indoor and outdoor ones, as well as pre-lit Christmas trees.
"...Pros: ✅ Effective Repairs: Quickly fixed several non-working light sets, restoring them to full functionality...." Read more
"The Ulta Lit Light Keeper PRO is a fantastic tool for fixing miniature light sets...." Read more
"...how the device works and I found out so much stuff that helped me fix my light strings...." Read more
"...IMO, the LightKeeper Pro beeper function would be terrific on a string of lights, stretched out, but it didn't have any utility for me on the prelit..." Read more
Customers find this light tester to be an amazing tool with great features, describing it as neat and handy.
"...Its user-friendly design, diagnostic capabilities, and effectiveness make it a reliable and cost-saving investment for holiday decorating enthusiasts..." Read more
"...I found the most useful features are the trigger, the bulb tester and the storage compartment in the handle...." Read more
"...These are great tools that solve a problem but also empower the owner to get organized!" Read more
"...For the price, this is still a lovely little tool, and if you still have numerous and various strings of mini incandescent lights as we do, and you..." Read more
Customers appreciate the light tester's ability to check individual bulbs and fuses.
"...Its user-friendly design, diagnostic capabilities, and effectiveness make it a reliable and cost-saving investment for holiday decorating enthusiasts..." Read more
"...I found the most useful features are the trigger, the bulb tester and the storage compartment in the handle...." Read more
"...The bulb pullers are very helpful. The bulb testers are immensely helpful...." Read more
"...Its handy bulb tester was great, and the bulb-puller also quite useful...." Read more
Customers find the light tester to be a lifesaver, reporting that it saved their Christmas trees, prelit trees, and decorations.
"...It lasted 12 years and helped fix many of our holiday lawn ornaments...." Read more
"...By using this great tool I am able to keep my tree. It is so satisfying to see all of the lights working...." Read more
"...Great buy and saved time and my sanity. And prob my marriage because i didn’t have to go buy another tree. Lol...." Read more
"...5 minutes later, and the garland looks brand new and it fully lit...." Read more
Customers have mixed experiences with the light tester's functionality: while some report it works like a charm and gets light strings working, others mention it doesn't work at all or specifically on LED sets.
"...Its user-friendly design, diagnostic capabilities, and effectiveness make it a reliable and cost-saving investment for holiday decorating enthusiasts..." Read more
"...The first thing you need to know is that it will NOT work with light sets that have a programming box for multiple blinking options...." Read more
"...✅ Fuse tester works perfectly, making troubleshooting simple. Overall, this is a must-have for anyone dealing with holiday lights...." Read more
"...The fuse tester works great as I temporarily took a fuse from a working string and tested it just to see how the fuse tester works...." Read more
Customers have mixed experiences with the light tester's ease of use, with some finding it straightforward and appreciating the instructional videos, while others report that the instructions are difficult to understand and the process is finicky.
"...a few faulty light sets from previous holiday seasons, focusing on ease of use, effectiveness, and versatility. Pros:..." Read more
"...✅ Fuse tester works perfectly, making troubleshooting simple. Overall, this is a must-have for anyone dealing with holiday lights...." Read more
"Works. Not the easiest instructions on how to use." Read more
"...the bulb checker works nice. easy to use. this goes with the fuse checker as well. the voltage checker is weird...." Read more
Customers have mixed experiences with the light level: while some report that their tree is lit again and the lights are glowing brightly, others mention that only half of the string lit up or that their lights were still out.
"...Infrequently a bulb was VERY dim and it would be replaced. Sometimes a bulb was black from the internal fuse blowing and it would be replaced...." Read more
"...It actually lit up the front of the sleigh! I followed the directions and tried to get the back..." Read more
"...For about 3 hours this past season, I noticed my main Christmas tree didn't light up...." Read more
"...Clicked 3 times and voila! The lights all gratifyingly came on...." Read more
Reviews with images

100% Functionality on ~30 Year Old Prelit Christmas Tree
Top reviews from the United States
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- Reviewed in the United States on December 12, 2024The LightKeeper Pro® is a specialized repair tool designed to fix issues in incandescent Christmas light sets. With its UL-listed safety certification, the tool aims to save time and money by diagnosing and repairing common light string problems. I tested the LightKeeper Pro® on a few faulty light sets from previous holiday seasons, focusing on ease of use, effectiveness, and versatility.
Pros:
✅ Effective Repairs: Quickly fixed several non-working light sets, restoring them to full functionality.
✅ Easy to Use: Simple instructions and intuitive operation make it accessible for all skill levels.
✅ Diagnostic Features: Built-in voltage detector helps identify faulty bulbs or issues in the wiring.
✅ Cost-Effective: Saves money by extending the life of light sets instead of replacing them.
✅ Compact Design: Lightweight and easy to store alongside holiday decorations.
Cons:
❌ Incandescent Only: Not compatible with LED light sets, limiting its use for modern decorations.
❌ Learning Curve: Initial setup and understanding the functions may require reading the instructions carefully for first-time users.
Performance and Usability:
The LightKeeper Pro® excelled at identifying and repairing issues with incandescent light sets. Its "Quick Fix Trigger" worked seamlessly to restore non-functioning sections of the light string, and the bulb puller and tester tools were practical additions. The built-in diagnostics allowed for fast identification of burned-out or loose bulbs. After a brief learning period, the tool was straightforward and efficient to use.
Comparison:
Compared to replacing an entire light set or attempting manual repairs, the LightKeeper Pro® is a game-changer. While LED repair tools are available for modern light sets, this tool remains a top choice for those still using incandescent lights.
Who Is This For?:
This tool is ideal for anyone with a significant number of incandescent holiday lights, especially those who prefer to repair rather than replace decorations. It’s a must-have for homeowners, decorators, or anyone who wants to simplify holiday preparations.
Conclusion:
The LightKeeper Pro® is an indispensable tool for maintaining incandescent Christmas lights. Its user-friendly design, diagnostic capabilities, and effectiveness make it a reliable and cost-saving investment for holiday decorating enthusiasts. While it’s not compatible with LED lights, it delivers excellent results for its intended purpose.
- Reviewed in the United States on March 29, 2025The Ulta Lit Light Keeper PRO is a fantastic tool for fixing miniature light sets. While I don’t have a pre-lit tree to test it on, I found that it works great on a standard string of lights when stretched out.
✅ Bulb removal is easy—the tool helps dislodge stubborn bulbs with ease.
✅ Storage compartment is a nice touch, keeping small parts organized.
✅ Fuse tester works perfectly, making troubleshooting simple.
Overall, this is a must-have for anyone dealing with holiday lights. Highly recommended!
- Reviewed in the United States on December 5, 2014I found out about this device by watching a christmas light troubleshooting segment on a morning show and when I saw the price, it was a no brainer to get one and try to fix many strings of lights that I quit using because I wasn't able to get them to work.
It's great that the packaging is non-destructive (you don't have to slice it open to get the item from the packaging) and clever that the instructions are built into the foldout back side of the packaging so after you are done with the light keeper pro, you can put it back in the package and hang it on your tool wall for the next time you need it.
If you are one that learns better through visuals like me, one who wants to learn about light strings and how the tool works, or have icicle or netting lights to fix, I highly recommend going to the Ulta Lit website and watching the 40 minute detailed instruction video. I did because I was curious about how the device works and I found out so much stuff that helped me fix my light strings. I like how Ulta Lit is so transparent in that they want you to know why light strings work the way they do or how their tool works to fix light strings and not just demonstrate procedures on how to use their tool.
Some light strings I was able to fix with the trigger function.
Another light string I was able to fix using voltage detection method. I find the voltage detection feature of Light Keeper Pro so-so and I ended up using my stand-alone non-contact voltage detector tool to help me find the area I needed to concentrate on to fix that light string.
The online 40-minute instructional video really shined on a difficult issue I had wtih one of my icicle light string. First, there is a dedicated section of the video that talks about troubleshooting icicle lights so I followed the advice and got to an area to investigate within the non-working section. I next used the bulb tester to test bulbs in that area and they were all fine. Finally, I was about to give up on that string until I remembered the part of the video about christmas light sockets. Thank goodness some light sockets are repairable as I had always thought they were molded sockets and not just contacts slid into channels in the socket. I inspected each socket in the burnt out area just to rule that out before giving up on the string and I found a socket that needed its contact reset so I followed the instructional video procedure to remove the wire with contact and put it back into place in the socket and that got me going with that icicle string!
The fuse tester works great as I temporarily took a fuse from a working string and tested it just to see how the fuse tester works.
I found the most useful features are the trigger, the bulb tester and the storage compartment in the handle. I've taken a few clear (for icicle), multicolor bulbs and some extra 3A fuses and put them in the handle so they are handy when I need them.
So far I've gotten every light string that was broken working again and now I have more light strings to use for decoration!
Top reviews from other countries
- AnastasiaReviewed in Canada on December 11, 2024
5.0 out of 5 stars Saved my Pre-lit Christmas Tree
A section of lights on my many-years-old pre-lit tree went out. After trying all the suggestions the internet had to offer I purchased the LightkeeperPro based on a random blog post. I was skeptical but desperate. One click of the trigger and the lights came back on! I am pleasantly surprised that it worked so well and so easily. It’s a bit pricy but worth it for the time it saved and not having to replace the tree.
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AbrahamReviewed in Mexico on December 4, 2022
5.0 out of 5 stars Muy útil y fácil de usar
Las instrucciones no me parecieron muy claras, pero con un vídeo en YouTube fue suficiente para comprender lo fácil que es su uso. Nos ha ayudado muchísimo a reparar series de luces sin invertir horas. Muy recomendable.
- Amazon CustomerReviewed in the United Kingdom on January 24, 2021
5.0 out of 5 stars Awesome tool!
One word! AWESOME. A big section of my pre-lit Christmas Tree was not lighting up. I had tried randomly changing bulbs but gave up quite quickly as I was never going to work out where the fault was. The light keeper found the fault in seconds. So easy to use and worth every penny - no need to buy a new tree or string lights!
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ROSALIOReviewed in Mexico on December 23, 2022
5.0 out of 5 stars la facilidad para arreglar una serie que se encuentra entreverada
excelente producto muy facil de utilizar
- lorraine pattonReviewed in the United Kingdom on February 16, 2022
5.0 out of 5 stars 8
Just purchased the light keeper pro found & fixed my lights in no time at all this is an awesome tool which I would highly recommend. Worked for me.