The project is in the very early stages; if you go read the blog, you'll see that I'm not only thrashing around a lot, I'm making a lot of mistakes along the way. I'm on version 3 or 4 of the prototype, depending on what counts as a prototype. I have at least one more version to be feature complete; I want a face that lights up, and some kind of vibration alert.
Where can I get a ruler like the one shown in the pictures?