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Several of the shots, notably the first in your previous post, have what may be a double bevel in them - like the finer hone isn't reaching all the way to the edge. Also, the stria at the edge...

Yes, the measurement tool of the microscope software is calibrated against a physical scale at the distance and magnification level to be measured prior to actual measurement. The bevel in the...

I have what looks to be the same microscope but labeled 'Celestron'. If so, you should be able to access a much higher level of magnification by moving the head of the unit right down to the razor...