Micrometer vs. Nanometer

A device for measuring very small distances, objects, or angles, especially one based on the rotation of a finely threaded screw.

One billionth (10-9) of a meter.

See micron.

Alternative spelling of nanometre

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

A metric unit of length equal to one billionth of a meter

Alternative spelling of micrometre

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.

Caliper for measuring small distances

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