Then, look at the thimble scale. The thimble scale of a metric micrometer has a measuring range of 0.025 inches (one complete revolution), and is divided into 25 increments. Each increment represents 0.001 inches.

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When reading the thimble scale, identify the number that aligns best with the index line on the sleeve scale. If the index line falls between two values, the reading will be the number immediately below the index line.

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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. In the example, the value on the thimble scale is 0.024 inches.