Explanatory notes
… gas burettes, test-tubes, etc.), stirrers, distilling flasks, graduated jars, culture flasks (Kolle, Roux, etc.), … or appliances ( heading 90.18 ); hydrometers and similar floating instruments, thermometers, pyrometers and … and apparatus of heading 90.26 (for measuring or checking fluid flow, etc.) and instruments and apparatus for physical …