Millimeter vs. Micrometer

Millimeternoun

alternative spelling of millimetre|from=US

Millimeternoun

A lineal measure in the metric system, containing the thousandth part of a meter; equal to .03937 of an inch. See 3d Meter.

Millimeternoun

a metric unit of length equal to one thousandth of a meter

Micrometernoun

An SI/MKS unit of measure, the length of one millionth of a meter. Symbols: µm, um, rm.

Micrometernoun

A device used to measure distance very precisely but within a limited range, especially depth, thickness, and diameter.

Micrometernoun

An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass.

Micrometernoun

caliper for measuring small distances

Micrometernoun

a metric unit of length equal to one millionth of a meter

Micrometernoun

a gauge that measures small distances or thicknesses between its two faces, one of which can be moved away from or towards the other by turning a screw with a fine thread.

Micrometernoun

US spelling of micrometre

Micrometer

A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of components in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers. Micrometers are usually, but not always, in the form of calipers (opposing ends joined by a frame).