Hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments
Hydrometers, areometers and similar floating instruments, barometers, hygrometers and psychrometers, whether or not combined with each other or with thermometers
Parts and accessories for hydrometers, areometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, n.e.s.