A tattoo machine is a hand-held device generally used to create a tattoo, a permanent marking of the skin with ink.

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A tattoo machine is a hand-held device generally used to create a tattoo, a permanent marking of the skin with ink. The basic machine, which he called Stencil-Pens, was invented by Thomas Alva Edison and patented in the United States in 1876. It was originally intended to be used as an engraving device, but in 1891 Sean Casey discovered that Edison’s machine could be modified and used to introduce ink into the skin, and later patented a tube and needle system to provide an ink reservoir.