When pronounced with the accent on the second syllable, a device used to measure minute thicknesses utilizing a fixed dead-weight pressure. A micrometer is used in measuring the thickness of paper caliper, or the packing of the plate and blanket on a printing press.

When pronounced with the accent on the first syllable, a unit equal to 0.000001 meter (one-millionth of a meter), also called a micron.

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