Product Density Measurement Range: 1.0-1.070, Minimum Scale is 0.001 Concentration Measurement Range: 0-100C, Minimum Scale is 1C Measurement Range: 0-10% Salinity Graduation: 0.2% Salinity Accuracy: 0.2% ATC: 0-10C Reference Temperature: 20C Package Contents 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 (recognizable by daylight), adjustable Focus adjustment eyepiece. 2.MaterialDesigned for salt water and saline solution concentration testing, ideal for aquarium, marine surveillance, aquaculture fish shrimp crab coral etc. and quality control in research and clinical laboratories. 3.Easy to UsePlace 2, 3 drops of the sample on the main prism, close the plate and look around the sali through the viewing window nity value. 4. Our chrome-plated brass body is resistant to chemical corrosion and wear-resistant, the life of the refractometer is increased several times than other aluminum bodies. 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%.