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a. An instrument for measuring very small dimensions or angles. Used in
connection with a microscope or a telescope. There are a great variety of
forms, but in nearly all, the measurement is made by turning a very fine
screw, which gives motion to a scale, a spider line, a lens, a prism, or a
ruled glass plate. Standard, 2
b. A unit of length, equal to one-millionth of a meter. Symbol, mu m. (1
mu m = 10-6 m). Formerly called micron.
c. A micrometer caliper. Standard, 2
Source:
Dictionary of Mining, Mineral, and Related Terms
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