CPV code 31642400 designates Detection apparatus for non-metallic objects in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
31642400 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 31642000 (Electronic detection apparatus).