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					Originally Posted by FrayAdjacent
					
				 
				Probably because most people can't read a vernier scale.  I had to learn when I picked up a Sharps type rifle with a long range sight setup on it.  Minute of Angle on a vernier scale. 
			
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My dad, a machinist, taught me how to read vernier calipers when I was less than ten years old.  I still don't have set of dial indicating calipers... mine is an old, but trusty Fowler vernier caliper.
There... I used the word "vernier" twice, err, three times.