I was cleaning out some closets today when I ran across this Helium Neon Laser tube. Before laser pointers came around this was the only way a normal person could obtain a laser. Was to buy a tube and build a power supply. When I was in high school you had to go to a museum to see a laser. I found a schematic for a power supply in a magazine that used a car coil. I saved up buy the tube and built a laser. Surprisingly 18 years later it still works.