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1/20Th Inch Markings On Ruler

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MTbowels | 15:48 Thu 18th Sep 2014 | Science
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I've got an engineer's 12 inch steel rule that has each inch divided up into 1/20th of an inch graduated divisions. Who would need to use such a scale? I do remember using wood rulers at school many years ago that had tenth of an inch divisions marked on it and I never managed to fathom out who would use them either!

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For some reason that truncated, I meant to say less than 0.4 mu m for machined seal surface finishes but you really have to screw your eyes up to see them :-)

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