Hydrometers, areometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments
Hidrometri in podobni merilniki, termometri, pirometri, barometri, higrometri (vlagomeri) in psihrometri, tudi kombinacije, z možnostjo registriranja ali brez nje