I bet they are very popular in gay bars! Although, maybe not to scale.Adam Savage has a scale tatooed on his forearm - metric and imperial. He uses it all the time. It's not all that uncommon.
View attachment 7689800
Ask Adam: Have You Used Your Tattoo Yet? - Tested
In this Ask Adam, Adam answers McCauley Photography's question about his arm tattoo (which is a ruler, if you haven't noticed it). Here's Adam's answer, and you can ask your own question in the comments section below or on social media (tagged #AskAdamSavage)!www.tested.com