Quote from:

http://astro.umsystem.edu/atm/ARCHIVES/SEP99/msg00181.html

 

Question: 
Anybody know where I can buy a tape measure blade or something similar
marked in tenths or some fraction thereof?  I'm trying to build a simple
optical bench 10' long or so, and I'd rather work in tenths and
hundredths if possible...
 
Answer:
What's wrong with cm/mm...<g>  
 
Machine tool suppliers have decimal inch scales but the longest one I saw was 48" & cost mucho dinero.

 

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