6.05 Micrometer

The micrometer is another instrument which uses a secondary measuring scale to increase the resolution of the device

To read a value from the micrometer you first read the value on the main scale
you then read off the value on the finer secondary scale where the horizontal line of the main scale lines up with the secondary scale.
You then put a decimal point in front of the reading from the finer scale and then just add it to the value from the main scale