This is exactly what I have been looking for. I have a Moleskine notepad that I keep with me at all times and I don’t know how often I’ve needed a ruler that is marked in millimeters. One of these rulers has already been added to the collection of goodies I keep within the covers of my intrepid notebook. I think I’ll print out the color square rulers too just in case I need to take any photos that need a scale next to it. Never know when I might see a bigfoot track out in the wild.