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you read a ruler by conting the little lines first
They denote different fractions of the inch. A good engineers ruler will have 64 ths, 32 nds 16 ths and 8 ths at least.
If the lines are on the opposite side of the inches on the ruler, then yes. You must keep in mind, however, that a ruler is used for inches and that the centimeters may not be marked.
The millimeters on a ruler are the tiny lines in between each centimeter
it means halfs