Specifications: Measuring Range Salinity: 0-100 ppt Brix: 0 to 10% Density: 1.000 to 1.070 g/cm3 Division Salinity: 1ppt Brix: 0.1% Density: 0.001 g/cm3 Accuracy Salinity: ±1ppt Brix: ±0.1% Density: ±0.001 g/cm3 ATC: 10~30°C Reference Temperature: 20°C. How to use: * Measure concentration of salt water & brine or salinity in water * Used for quality control in research, clinical laboratories, food & beverage industry * Have better management marine saltwater tank * Ensure pets are safe in your aquarium & water has exact level of salinity they need to survive & thrive in their typical marine environment * Maintain proper concentration of your cutting and grinding fluids & save your money! * Works w/ low sugar related food like tomato juice,tea,etc. Just few drops on testing prism, cover, look and read the result!. Package Includes: 1)1 x Refractometer 2) 1 x pipette 3)1x instruction manual 4)1x mini screw driver 5)1x cleaning cloth