<http://schema.org/description>
"&lt;p&gt;Properly cleaned stainless steel is naturally protected from corrosion by a thin, passive film. But this passive layer can be removed or scratched. A passivation meter measures the surface potential under controlled conditions.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.pfonline.com/articles/determine-passivation-of-stainless>