Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: Total waste of money
Review: These blacklights are far too close to the visible light spectrum to be of any use at all. In addition, they are so dim you have to hold them <1" from the surface you are trying to inspect. If you are looking for a portable blacklight, go with a flashlight with no higher than 385Nm. These must be 400+. I purchased three and needless to say, I will not be using any of them.
