I purchased this UV light to check on the need for our carpets to be cleaned. The light worked very well (the darker the room the better) so well in fact we decided to get new carpet.
I have the UV385 LUX PRO for several years. It cost $9.95 at Batteries Plus in Alabama and in Montana. Runs on 3 AAA batteries and I have not had to change them in 2-3 years. Great deal compared to $59 for the rechargeable one with the USB port. Several of my fishing buddies are very happy with theirs.
I'm (among many other things) an auto technician and I use this light to look for any coolant leaks. If there are any the coolant glows under the uv light making it easier to find any leaks in the radiators, hoses, heater cores, or engine blocks. I like that its small and bright and without a doubt definitely makes my job alot easier. Thanx so much this is 1 of my favorite tools. Only down side is it sucks the batteries dry fairly quick...but not everyone is using it to check as many as 15 cars a day like I do, so this may only be a small issue for me. My light usually lasts about 3 days worth of work on 1 set of batteries. Compared to the 1 my coworker has from a different company which lasts only 1 1/2 days.....so I guess I'm good!!