This makes it hard to create a laser which can do damage from more than around a meter and is why most demonstrations on YouTube are that distance or less. [Styropyro’s] handheld, DIY laser ...

He first came across the technology via videos from [styropyro], whose work we’ve featured before. The tattoo removal gun features a YAG laser, which is pulsed to create a high power density.

“This laser is several times over the limit at which a direct hit to the eyes would blind you instantly and forever,” Styropyro says early on, “so that’s why I wear these safety goggles.