… Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, …
Explanatory notes
… determining the fatty content of butter), ureometers (for testing urea content); these are classified in heading 70.17 … meteorological thermometers (e.g., for measuring solar or terrestrial radiations), thermometers used in hydrography … since they are designed to indicate the highest and lowest temperature they have recorded. (2) Metallic thermometers …