✅Accurate Salinity Measurements: This optical refractometer accurately measures the salinity of seawater or low concentrated salt solutions, ensuring precise monitoring of saltwater concentration. ✅Easy Calibration and Operation: The refractometer can be easily calibrated using fresh water or a solution matching 35ppt seawater, making it user-friendly for reef aquariums and marine industry applications. ✅Auto Temperature Compensation: With built-in Auto Temperature Compensation (ATC), this refractometer provides accurate measurements regardless of temperature variations. ✅Comfortable and Durable Design: Featuring a soft rubber eyepiece and non-slip rubberized grip, this refractometer offers comfortable handling and reliable performance. It meets strict quality and safety standards. ✅Versatile Applications: This refractometer is perfect for checking saltwater concentration, quality control in laboratories, and managing marine saltwater tanks., Weight: 0.24030386558 Pounds, Manufacturer: Gain Express Holdings Ltd