specific gravity/density meters, namely, meters for measuring variations in density or salinity in seawater for use in aquariums and other fields where the density of a solution needs to be measured

Seawater reference solution used to calibrate a gravity meter; natural and artificial seawater solutions for use in home aquariums

Production of energy; production of electrical energy from renewable sources

Meteorological apparatus and instruments; oceanographical apparatus and instruments; surveying apparatus and instruments; floating apparatus for measuring, recording and processing meteorological, oceanographical, environmental, biological, chemical, radioactivity and water turbidity data at sea, and detecting, observing and surveying wild life at sea

specific gravity/density meters, namely, meters for measuring variations in density or salinity in seawater for use in aquariums and other fields where the density of a solution needs to be measured