<http://schema.org/description>
"In most cases, a standard or dial indicator is adequate for gaging requirements. However, sometimes the normal orientation of a standard indicator does not work for a particular application. In this situation, a perpendicular indicator might be the better choice."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mmsonline.com/columns/the-case-for-the-perpendicular-indicator>