Metric micrometers

Metric micrometers are read as follows: First determine the number of whole millimeters (if any) and the number of hundredths of a millimeter, as with an ordinary micrometer, and then find a line on the sleeve vernier scale which exactly coincides with one on the thimble. The number of this coinciding vernier line represents the number of thousandths of a millimeter to be added to the reading already obtained. Thus , for example, a measurement of 5.783 millimeters would be obtained by reading 5.5 millimeters on the sleeve, and then adding 0.28 millimeter as determined by the thimble. The vernier would then be used to read the 0.003 (as shown in the image).