The Optical Salinity Refractometer is a precision tool for measuring salt concentration and density in seawater, aquariums, brine solutions, and low-sugar liquids. With an ATC feature, it delivers reliable readings without being affected by temperature changes. Ideal for aquarium hobbyists, mariculture breeding, laboratories, and food & beverage industries, this refractometer helps ensure marine life health, optimize fluid concentrations, and improve quality control. Simply place a few drops of the sample on the prism, close the cover, and read the results instantly. Main Features Wide Measuring Range: Salinity 0–100 ppt; Density 1.000–1.070 g/cm³. High Accuracy: ±1ppt for salinity; ±0.001 g/cm³ for density with clear scale readings. Auto Temperature Compensation (ATC): Ensures precise results between 10–30°C. Multi-Purpose Use: Suitable for aquariums, mariculture, food & beverage, clinical labs, and industrial solutions. User-Friendly Design: Rubberized non-slip grip, adjustable focus, and easy calibration. Specifications Measuring Range: Salinity: 0–100 ppt Density: 1.000–1.070 g/cm³ Accuracy: Salinity: ±1ppt Density: ±0.001 g/cm³ Division: Salinity: 1 ppt Density: 0.001 g/cm³ ATC Range: 10–30°C Reference Temperature: 20°C Use: Aquarium, Mariculture, Food & Beverage, Lab Testing, Industrial Fluids