PCE-DRS 2 Water Analysis Meter - Salinity / Chlorine Refractometer Waterproof IP65-rated salinity or salt content (‰) / chlorine content (‰) / specific gravity (SG) / refractive index (nD) refractometer with easy-to-read LCD. PCE-DRS 2 is a handheld digital sodium chloride (NaCl) and chlorine (Cl) refractometer used to determine the salinity or salt content (‰), chlorine content (‰), specific gravity (SG) and refractive index (nD) of liquid. This waterproof IP65-rated digital refractometer features automatic temperature compensation (ATC) from +10 ... +40 °C / +50 ... +104 °F, as well as a large, easy-to-read LCD that shows both the measured value and the temperature.