This is an ultraviolet lamp nice size, useful for the detection of certain DIY leaks or traces of urine of animals. For counterfeit notes, I prefer a much smaller lamp in my bag is more discreet. It is still 15 cm in length for 245 g and a light 5 cm diameter facade. She appears to be very solid and good design. I appreciate the 3 AAA batteries and is delivered with the little strap has its uses. This is an ultraviolet lamp and only this function.