As JC explains, this prototype isn't something he could use every day at a tattoo parlor. Just cleaning it is a "very long and meticulous" process, he says. With that in mind, he and Gonzal are planning a second prototype that would be much more practical. Is this a niche device that won't be useful for most amputees? You bet. However, it's further proof that artificial limbs can have their advantages in the right circumstances.