LIGHTKEEPER PRO Plus 100 Bulbs…

I still don't understand how this works, but it does! My tree has built-in lights, and this year when I turned it on, there were three big sections of lights out. I replaced all of the fuses I could find. I carefully replaced every single bulb in one of the sections (about two dozen of them). Didn't help. I was about ready to just throw the whole tree away and buy a new one, but I decided to google for advice first, and found a few people recommending this thing. I watched a youtube video on it, still didn't quite understand how it worked, but ordered it anyway.When it arrived, I removed one of the bulbs in a dead section, plugged this thing in, pulled the trigger, and the whole section immediately lit back up. Tried again with the other two dead sections, same thing. My tree is now working perfectly and it took less than a minute to fix it with this thing. I can't believe how much time I wasted before ordering this.Bonus: it came with 100 replacement lights, so I was also able to find and replace all of the individual burnt-out lights on my tree and now it is truly back to 100%.

This device can help you solve every problem that can happen with strings of miniature bulbs. Our artificial tree is 8ft tall with 1500 bulbs on 15 strings. We bought the tree in 2014 and got the Lightkeeper pro in 2015. Over 8 years we have replaced more than 400 bulbs (20 to 100) bulbs every year, the LightKeeper Pro makes it easy to find the problems. 1. The most common light problem is just that a few bulbs on a string burn out, those are easy to find without any tool. Just replace them right away, if you don't lots of bulbs will start to fail due to the rest on the string getting overloaded, so fix them asap! Sometimes when a replacement bulb doesn't light, you can test the bulb with this tool, to see if its actually ok and you just didn't seat it right. 2. Every year when we take the tree out again, some strings will not light up at all. This often means that a bulb mechanically failed, maybe a filament broke or bulb came out of a socket. You can power the string and use the tool beeping to trace the wire to find where the current flow stops. Then reseat the lamp or bulb or replace the bulbs.3. Sometimes strings don't light because multiple bulbs fail without fusing. You can plug the string into the tool and press the trigger 30 times to zap the failed bulbs to get them to allow current to flow to the rest of the string. Then when you power the string, most of it will light up and you can replace the dead bulbs as usual. We've had our tree a long time, but it takes a couple of hours every year to keep it working. If you don't replace failed bulbs right away, you will drastically shorten the lifespan of the remaining bulbs, and your tree will not last. We would not be able to keep up the tree without the LightKeeper Pro.

Pros: comes with many bulbs, the bulb tester works great, storage compartment on the side is a nice touch, saved my prelit tree, didn’t have to replace every bulb on my tree thanks to the bulb testerCons: the fuse ‘charger’ is questionable, the light string voltage tester doesn’t really help you find the exact bulb that went out unless you have a straight line of bulbs (it’s very difficult to follow bulb lines on a prelit tree)

Just got this today, tried it, and it didn't work for multiple sets of lights. Here's why. I think ALL the bulbs are burnt out, and this device is useless in that scenario. How did this happen? The manufacturer downplays this scenario, but when you have a strand of Christmas lights connected in series (the most common type), and one goes out, even if the shunt works for that burnt bulb, the remaining bulbs see a higher voltage and will burn out more quickly. When the next one burns out, the voltage goes even higher, which shortens the life of the remaining good bulbs even more. This leads to a cascading effect where, eventually, all of the bulbs will burn out completely in rapid succession, not a single good one is left. This device may work in the rare circumstance when you have just one bad bulb in an otherwise good strand and the shunt didn't work properly for that one bulb, but not in the most common case I just described. They sort of admit this on a small white piece of paper that they include with the device (in one short sentence), but, of course, this is not well explained before you buy it. For this reason, it is a waste of money for me, and image for many people in the same circumstance. Save your money and just buy a new strand of lights. I wish I would have realized this before buying, but oh well. The bulb and fuse checker might be moderately useful at some distant point in the future, but as of right now, it will collect dust on the top shelf.

It's a great tool and worked great right off the bat but then when I went to use it on the second row of lights on my pre-lit Christmas tree, not so good. I went through all the bulbs and it didn't find The One that was out so I replaced them one by one and finally the lights came on. It just seemed like it worked sometimes and then others it didn't so not sure I would buy again.