Excellent scales graduated in both English and Metric, in various lengths,
can be obtained from drafting supply stores.
 
Several years ago Carolina Biological sold adhesive backed peel-off
photographic scales 5 cm long, graduated in centimeters, in rolls.  They
could be stuck to any background
(getting them off was a bit more complicated).  They were cheap and accurate
to 0 .5mm
 
Curtiss Peterson
THE RESCUE COMPANY
Box 88
Rescue, Virginia  23424
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Historic Resource Development
Preservation Planning
Conservation
Curation