How in the hell? Laser Vein Finders
I am starting a new video series called "How in the Hell" where I go over how really neat technology works in a short video. Today, I am covering Vein Finders, those really neat devices that can project your veins right onto your arm with a laser.
Hackaday:
https://hackaday.com/2016/05/19/diy-v...