This 6 inch hand held blacklight can be used for a variety of purposes. Best of all, it works great with blacklight reactive inks and paints! You can also use this light to identify pet stains, bacteria, and counterfeit money just to name a few.A convenient fold away stand lets you prop your light up right when hands free work dictates it. You can toggle from blacklight to torch with one simple flip of a switch. Light requires 4AA batteries (not included).