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, ideal for aquariums, marine surveillance, aquaculture, fish, shrimp, crab, coral, and quality control in research and clinical laboratories. 3. Easy to use: Place 2 or 3 drops of the sample on the main prism, close the cover plate, and look through the viewing window to read the salinity value. 4. Chrome-plated brass body resists chemical corrosion and wear, extending the lifespan compared to aluminum housings. 5. Measuring range: salinity 0-10%, density 1.000-1.070 SG, accuracy: salinity +/- 0.2%, density +/- 0.001 SG.