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 bottom photo is in fact just over 1mm wide - 75mm is nearly 3", I don't even own an axe with a bevel like that!
Also, you can't judge the scale of an image based on its size on your monitor, especially if the image has been scaled to fit a web page.