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 Developed for testing the concentration of salt water and saline solution, ideal for aquariums, marine surveillance, aquaculture fish shrimp crab coral etc. 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 plate and look through the viewing window to read the salinity value. 4. Our chrome-plated brass body is resistant to chemical corrosion and wear-resistant, the lifespan of the refractometer is increased several times than other aluminum housings. 5. Measuring range: salinity 0-100% (0-10% salinity), density 1,000-1,070 SG, accuracy: salinity +/- 1%, density +/- 0.001 SG, accuracy: 0.2%.