Value settings and onscreen measurement ...

here is a useful link ... for onscreen measurement device

deegam settings can be converted ... 1mm = 3.6 pixels
this clear-vue pixel ruler , is useful for 100% or scaled images ... for larger than normal scans, use ratio method.

first I scan a stockcard with mm ruler ...  when scanned, I apply the onscreen measurement tool.   used as a caliper - it speeds the sort by value settings ...  try it !

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