కొలత: కూర్పుల మధ్య తేడాలు

* [http://www.nikon.com/about/feelnikon/universcale/ 'Universcale', an application showing the relative sizes of objects]

* [http://www.unc.edu/~rowlett/units/index.html A Dictionary of Units of Measurement]

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Note: The only official URI I could find is http://www.euramet.org/index.php?eID=tx_nawsecuredl&u=0&file=fileadmin/docs/Publications/Metrology_in_short_3rd_ed.pdf&t=1221708086&hash=e0c4afb310197736cdecc01346f9aae9 which didn't seem suitable for many reasons.