How to Read Vernier Micrometer
Most micrometers can read to one thousandth of an
Vernier micrometers can read to one ten-thousandth of an
Consider the micrometer reading shown below:
If this was a 0 - 1" micrometer it would read somewhere between 0.255"
(250 on the Sleeve, with more than 5, but less than 6 on
Usually this would be close enough however some times
we need to be more accurate.
Vernier micrometers have lines marked on the sleeve
that let you read ten-thousandths of an inch. Each
line is equal to .0001".
To show all the vernier markings I have "flattened"
the sleeve of the micrometer. A real micrometer looks a
little different and I encourage you to ask for a
vernier micrometer so you can experiment with the real
In the figure shown below, I have the same reading as
before, only now we are using the vernier micrometer.
The above micrometer reads 250 on the Sleeve and 5 on
the Thimble = 0.255. Now look for the vernier mark
that lines up closest to any of the lines on the
Thimble. In this case it is the vernier marked 8.
The micrometer shown above reads 0.2558
It is easy to read what the micrometer is telling
you. It is VERY difficult to accurately measure to
.0001". This is due to the delicate feel that you must
have to make this accurate of a measurement. Before
you believe what your hands and micrometer are telling
you, you must make several measurements to ensure you
get consistent results.
Courtesy of LBCC Automotive Technology