Paleonet: Graticules

[Bruno Granier]

Hi,
can someone tell me what is the side length of a square (for instance,  
the square with F26 in the middle of 1, 2, 3 and 4) in the attached  
photo of a locator grid!?...
I assume it should be ~1 mm, but I am not 100% confident!
Thanks in advance,
Bruno Granier
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