Violet wands were an electrode shock medical device of debatable value that became popular in the early 20th century, and are an interesting collectible bit of medical history today. Here you can find various vintage violet ray machines on sale at bargain prices, with new opportunities appearing daily.
Violet ray devices consist of a Tesla coil and a wand with various attachments, and application of the violet wand was said to heal almost any ailment through bioelectromagnetic healing, along with growing hair. It is still in use for some purposes, and is also used in electrostatic leak detection.