… Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any …
Explanatory notes
… 90.25 ‑ Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any … ascertaining the density of liquids of different specific gravities are sometimes designed so that the weights can be …