Good advice!
Also, take a good look before you buy so that you select one that you can read comfortably. I bought one that had so many lines all thru it (1/8's I think), that I hate using. Wish I had put more thought into that one. I like having small 1/8 marks at the inch lines, but not lines both directions thru the whole ruler. I can't just take a quick glance at it - have to study it before lining up. Thank God for post it notes (I use them to mark my spot).