Our Draft Survey (Load Line) Hydrometer is suitable for use in sea or fresh water.
It was specially designed in collaboration with S.G.S. Van Bree N.V., Antwerp, member of the Société Générale de Surveillance S.A. Geneva, to ensure that when carrying out a Draft Survey on cargo carrying vessels the weight to volume relationship of the supporting water was precisely measured and accurately reported. Not all hydrometers on sale are manufactured to the very high standards of Zeal whose quality is universally relied upon.