A UV ultraviolet compact, pocket-sized mini black light tube holder for use with T5 4W UV tubes..This great value little unit is ideal for commercial applications such as forgery checking bank notes and stamps. Use it show secret writing in invisible ink or highlight glow in the dark effects. It has a built-in torch, on/off switch, fold away stand and a hand strap.Wavelength 300 nm & 400nm.Requires 4 x AA batteries not supplied.Need more help in choosing a suitable ultraviolet light bulb or tube? Read our guide Choosing Ultraviolet Bulbs UVA, UVB and UVC