ISO 387:1977 Preview
Hydrometers -- Principles of construction and adjustment
This standard was last reviewed and confirmed in 2010. Therefore this version remains current.
Glass hydrometers of constant mass which do not incorporate a thermometer are considered. Basis of scale, reference temperature, surface tension and reference levels for adjustment and reading are specified. In annex A the standard categories of surface tension are tabled, and annex B deals with the adoption of density as preferred basis of scale.
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