The upper knob of the mechanical stage moves the stage in which direction?
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The upper knob of a mechanical stage on a microscope typically moves the stage vertically in the upward and downward direction. This movement allows for precise adjustments of the specimen's position in relation to the objective lenses. Turning the upper knob in a clockwise direction often moves the stage upward, while turning it counterclockwise moves the stage downward. Adjusting this knob enables focusing and fine-tuning the position of the specimen being observed under the microscope.