The 'Micrometer' System

A micrometer (pronounced /mаɪˈkrɒmɪtər/) (enPR: mī-krŏmʹĭ-tər), sometimes known as a micrometer screw gauge, is a device used widely in mechanical engineering and machining for precisely measuring, along with other metrological instruments such as dial calipers and vernier calipers. Micrometers are often, but not always, in the form of calipers. [via wikipedia]

Thanks to ndanger for the photo.

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