Wire micrometer

a micrometer having spider lines, or fine wires, across the field of the instrument.

See also: Wire

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
This bulk rod, about 10 millimeters across, is then softened with heat and drawn out in a long thread, yielding wire micrometers across.