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hydrometers and similar floating instruments, thermometers, pyrometers, barometers, hygrometers and psychrometers, recording or not, and any combination of these instruments
densímetros, areómetros, pesa‑líquidos e instrumentos flutuantes semelhantes, termómetros, pirómetros, barómetros, higrómetros e psicrómetros, registadores ou não, mesmo combinados entre si