<http://schema.org/description>
"&lt;p&gt;When we talk about differential gaging, we are usually referring to the process of using two sensing devices and combining the results into one measurement.  The measured dimension is the change in the position of the two sensing components. &lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/a-different-differential>