This would be great for the ophthalmologists who work in the countryside, a portable eyesight checker.

This woodworker-graphic designer uses a tape measure or ruler almost every day. He decided to have one tattooed so he would have a ruler always within his arm's reach. He uses it for his work, but also for playing. He measured some trout for length with it on a fishing trip to Mount Hood, for example.

Subway map tattoo.

Erik Burke got himself a very useful tattoo to write down his to-do lists.

Medical alert tattoo.

Although there are only temporary, these tattoos can be very handy. Especially for those crowded days at the mall.

Avoid those moments of boredom with a "connect the dots" tattoo.

A very good reminder, a Pi tattoo up to 80 digits.

If you can't afford a pair of glasses or always forget to use yours, this could be your solution. MatthewG15 decided to get a pair of glasses tattooed to his face.

Get an instant moustache anytime you want to by tattooing one in your finger.

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