Full Description

This International Standard gives specifications for glass hydrometers of constant mass, for use in milk and liquid milk products with a surface tension of approximately 45 mN/m, which indicate density (g/ml) at 20 C (27 C in tropical countries).

Two types of hydrometers are specified, a precision type and a wide-range type, which comply in all important respects with lSO/R 387.

Notes on the verification of the hydrometers are given in annex A, a suitable hydrometer cylinder is described in annex B and a suitable thermometer is described in annex C.