Parts of a digital micrometers

Let us examine the construction of a digital micrometers. Digital micrometers are used to measure the length, diameter, or thickness dimensions. A digital micrometer consists of the frame, anvil, spindle, lock nut, sleeve, sleeve numbers, sleeve long line, thimble marks, thimble, and ratchet stop, LCD display, data output port, mm/in conversion key, and the ON/OFF ZERO key. See the picture of digital micrometers here.
Digital micrometers are available in a large amount of different sizes. Usually, there is the 0-to-25-mm (0-to1-inch), 25-to-50-mm (1-to 2-inch), 50-to-75-mm (2-to 3-inch), and 75-to-100-mm (3-to 4- inch) micrometers.

How to read the digital micrometer

Step1: The digital micrometer can provide high precision reading with the LCD display. So you can get the reading directly from the large LCD display. For example, the reading is 14.054 mm in the picture.

You can also get the reading by reading the marks on the sleeve and the thimble. Usually, we mainly get the reading from the large LCD display for the digital micrometer because the digital reading is more accurate. The reading on the sleeve and the thimble is just for reference. Step2: Read the markings on the sleeve and the thimble, firstly, read the point which the thimble stops at it on the right of the sleeve (It is 14mm here, because each line above the centre long line represents 1mm while each line below the centre long line represents 0.5mm).

Secondly, read the markings on the thimble, it is between 5 and 6. So you need to estimate the reading. (It is 0.054mm for each line here represents 0.001mm). At last, add all the reading up: 14mm + 0.054mm=14.054mm. So the total reading is 14.054mm.