Known as “The Cancer Ray,” one hobbyist set out on a mission to create the world’s first handheld UV laser pointer. UV laser diodes are used in high-end medical and industrial applications, but they aren’t cheap and they usually come with bulky support equipment. A small brand new UV laser diode runs you about $4500, simply because of the precision needed to manufacture and assemble them. This laser hobbyist was able to get a hold of a UV laser diode for just 80 bucks in some broken down equipment. By taking this old diode and repurposing it into some new tech, he turns it into the world’s first handheld UV laser diode.