This instrument measures the salinity and specific gravity of seawater, and utilizes a new material that is durable against salty samples, The salinity of seawater is displayed in parts per mill (‰). The MASTER-S/MillM is a good alternative choice when the water resistant feature is not a priority and the Temperature Compensation will be carried out manually Specifications Model MASTER-S/MillM Cat.No. 2493 Range Salinity : 0 to 100‰ Specific gravity : 1.000 to 1.070 Minimum Scale Salinity : 1‰ Specific gravity : 0.001