I can see a left-handed rotory cutter, like a pair of left-handed scissors.  But how would a left-handed ruler or tape measure be different from a "normal" one?  I flip my tape measure and ruler around to read from left to right or right to left as needed.  And both of them have markings on both sides.  I prefer the side with both standard and metric markings.  Although the ones that have them start from oposite ends of the same side drive me nuts.  I want to read both measurements at the same time so I can decide which one is better at the time.

Chris; pardon my ignorance.  I'm a rightie who frequently acts as if I'm left handed.