Product Density measurement range: 1.0-1.070, minimum scale is 0.001 Concentration measuring range: 0-100 C, minimum scale is 1 C Measuring range: 0-10% salinity Graduation: 0.2% salinity Accuracy: 0.2% ATC: 0-10 C Reference temperature: 20 C Delivery content: 1 x salinity refractometer, 1 x plastic pipette, 1 x mini screwdriver, 1 x cleaning cloth 1. Precision Measurement: Sharp dividing line (blue-white), good readability (daylight recognizable), adjustable eyepiece for focus adjustment. 2. Material: Designed for testing the concentration of salt water and saline solution, suitable for aquariums, marine monitoring, aquaculture (fish, shrimp, crab, coral), and quality control in research and clinical laboratories. 3. Easy to use: Place 2-3 drops of the sample on the main prism, close the cover plate, and read the salinity value through the viewing window. 4. Durable chrome-plated brass body resists chemical corrosion and wear, extending the refractometer's lifespan compared to aluminum housings. 5. Measuring range: salinity 0-10% (0-100 Brix), density 1.000-1.070 SG; accuracy: salinity ±0.2%, density ±0.001 SG.