Few significant proportion of seawater salinity meter meter saline solution for detection, control of industrial and marine aquarium, marine, fisheries, farms measuring seawater salinity, and processed foods low in salt solution. Or for detecting the specific gravity of the salt solution. Health care institutions, universities and other research can also be used. Measuring Scale Model No. Measurement Range Resolution Accuracy DR201 (sodium chloride (NaCl) Salinity sodium content S01 0.0--28.0% 0.1% ± 0.2% Salinity sodium content S02 0--280 ‰ 1 ‰ ± 2 ‰ Specific Gravity gravity S03 1.000-1.217 0.001 ± 0.002 Refractive Index refractive S04 1.3330--1.3900nD 0.0001nD ± 0.0003nD DR202 (sea water) Salinity sodium content S01 0--100 ‰ 1 ‰ ± 2 ‰ Chlorinity chlorine content S02 0--57 ‰ 1 ‰ ± 2 ‰ Specific Gravity proportion S03 1.000-1.070 0.001 ± 0.002 Refractive Index refractive S04 1.3330--1.3530nD 0.0001nD ± 0.0003nD