Registered: 02/16/08
Posts: 2463
Loc: Central California
I am looking for a combination ruler [that is or includes metric] and color bar to include in photographs of man and animal tracks. So far I can find them only separate.
Registered: 12/06/07
Posts: 418
Loc: St. Petersburg, Florida
Try a geological or archeological supply house, I have seen them, although B&W ones predominate. My small one has a N arrow and cm scales. I bought it from Miners (usual disclamer) www.minerox.com. I would expect that forensic suppliers would have them, but I have only seen them in kits with several in different colors.
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