Marketed to engineers and carpenters, Incra's rulers have tiny stenciled holes for every fraction to make it impossible to mess up length markings. I got one to make puzzle boxes, but it's now on my office desk as my daily driver and will probably outlive me. The standard 12" model comes in at $25 and I can vouch for it, but there's a knockoff by General Tools that's just $10. I assume it's basically the same thing, but if you look closely on the product photos, the holes are somewhat larger.
