CPV code 38421000 designates Flow-measuring equipment in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
38421000 sits under 38420000 (Instruments for measuring flow, level and pressure of liquids and gases) and groups 1 more specific sub-codes. When classifying a tender, choose the narrowest code that still covers the full subject of the contract.