When accuracy of 0.01 mm is required the micrometer
is the most common instrument. The external
measuring screw usually has an increment of 0.5
The base scale is on the sleeve and is graduated in
intervals of 0.5 mm. On the thimble there are 50
graduation marks which indicate 1/100 value (0.01
Micrometers also have a friction facility which allows
a constant measuring power which is important
when measuring 1/100 and 1/1000 mm measurements.
There are many different micrometers for different
appliances e.g. outer, depth, bore/hole measurements.
Further more there are micrometers whith
different designs for the feeler pin for special purposes.