The curves are measured by means of the millimetric tape; the diameters by means of the calipers.
The arms are then extended along the cross rod which is marked with a millimetric scale.
also millimetre, 1802, from French millimetre; see milli- + meter (n.2).
millimeter mil·li·me·ter (mĭl'ə-mē'tər)n. Abbr. mm A unit of length equal to one thousandth (10-3) of a meter (0.0394 inch).