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Measurements taken with micrometer are a combination of the value shown on the sleeve scale and the value indicated on the rotating sleeve scale.

When using a micrometer with an additional vernier scale, the value on the vernier scale may also be taken into account.

To get your total reading, add the values from each of the scales together (sleeve + thimble ( + vernier) = measured value).

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If this is the case, you should estimate the final part of the measurement or, if your micrometer has one, consult the vernier scale.

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Because the reading on the thimble scale fell roughly halfway between two values, we can estimate that the reading is in fact, 6.665mm.

If you have a vernier micrometer, you may next read the value indicated on the vernier scale (if you don’t have a vernier micrometer or don’t require the accuracy, go to Step 4).

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The reading on the vernier scale is the value that aligns best with any increment on the thimble scale (0.009mm in the image on the left).

The thimble scale of a metric micrometer has a range of 0.5mm (one complete revolution), with each increment representing 0.01mm, and usually numbered in 0.05mm steps. The value is the lowest number that aligns best with the index line on the sleeve scale.

The vernier scale of a metric micrometer has a measuring range of 0.01mm and is graduated in 10 increments. Each increment represents 0.001mm.