Is this a good LED UV Flashlight

I own a Rayovac Value Bright 9LED UV/Blacklight Flashlight, but I look it up on he internet and saw it is 400 nm. Upon further research I saw sites that said 400 nm isn't good and then other sites said that it's passable as a blacklight. So, is 400 nm really a blacklight or is it like a toy. I am able to see things that I can't see with my naked eye, like urine, carpet stains, theft powder, currency, ID'S, credit cards, etc, (everything I named I looked at) The package says it to do more, but I'll post a link, point is what will a 365nm 385nm see that my light can't because everything on the list that a 365nm can see my light can too. Should I get a 365nm or I am good with mine. (I don't even know if it is 400nm because, theres no nm on the package, but the Amazon description says 400+/-5nm don't know what that means.