A complete spin of ‘drum’ will produce an advance of 0.50 mm and the fifty divisions will ‘sweep’ the ‘reference line’. In this way, each division of the drum ‘marks’ the advance of 0.01 mm (one hundredth of a millimeter) of the spindle.

To interact with the micrometer simulation, you can

• drag the drum vertically using mouse to rotate
• drag instrument by dragging other than ‘drum’ part
• use mouse wheel or arrow keys to advance the drum
• Scroll the micrometer to view divisions more clearly using slider
• Generate different problems and practice them