Arachnid M1 Ultraviolet Mini Blacklight with Keychain

You can use this Mini Keychain Blacklight for many different tasks including counterfit bill detection, vaseline glass detection, lighting up invisible ink, pet stains, & others. Uses 4 AG3 batteries - 1 Set included. Note that Blue Invisible Ink may not show up well with 390nm LED lights, you may want to consider using Yellow Ink instead.