For finding pee spots?
The bigger the better and electric powered, not battery or solar. I had a small battery powered one...it wasn't strong enough and in order to find the spots it had to be just a few inches off the carpet. So I was either bending or crawling around on my knees. Didn't make for a fun time.
I've never done this, but it's what I've seen recommended. Go to a Home Depot or Lowe's or whatever home store you have and get an under the counter florescent fixture (usually about 2 ft. long) and a black light bulb to go in it. And an extra long extension cord if you don't have one.
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Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...