Nope! :nah: Definitely not.
Putting on my more serious hat (I was wearing a different one when I replied to Dennis ), I seriously wonder why anyone needs that sort of accuracy for marking. For cutting, I understand, but not for marking. I can't mark a line all that accurately (past maybe .005) with a pencil; the straight edge erodes some graphite from the side as I mark. A marking knife will follow the grain a hair here and there. Are my marking skills weak?