<http://schema.org/description>
"&lt;p&gt;The irregularity of a machined surface is the result of the machining process, including the choice of tool, feed rate, speed of the tool, machine geometry and environmental conditions. This irregularity consists of high and low spots that are machined into a surface by the tool bit or a grinding wheel. These peaks and valleys can be measured and used to define the condition and, sometimes, the performance of the surface.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/measuring-surface-finish-on-large-ods>