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Old 08-01-2012, 08:32 AM   #6
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Join Date: Jun 2007
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Originally Posted by newyorkstadium View Post
You need to account for the fact that some rulers have a blank bit at the end. Mine is 6mm, so I add 6mm as a result.
Not necessarily. If you're measuring to the same point on the upper and simply taking a difference, the extra length will cancel out.
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