This optical Brix & Salinity Refractometer is designed to measure seawater (marine aquaria) or very low concentrated salt solutions & low concentration of sugar solutions as well as reading salt solution density. With this refractometer, you can: 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 a few drops on the testing prism, cover, look and read the result! COMMON FEATURES ON OUR REFRACTOMETERS: Auto Temperature Compensation (ATC) 10~30°C, increase accuracy and eliminates concerns on temperature Easy to use & calibrate Cushioned with soft & comfortable non-slip rubberized grip, insulate test solution from body heat Adjustable focus & clearly defined scale, w/ large easy-to-read measurements Approved by strict quality and safety standards Features: RANGE: Salinity range is 0-100 ppt ; Brix range is 0~10% ; 1.000~1.070g/cm3 Density DIVISION: 0.2% salinity ; 0.2% Brix ; 0.001g/cm3 density MARINE AQUARIA: Measure salt water or salinity of water, ideal for aquariums and marine monitoring FOOD & INDUSTRIAL LIQUID: Maintain proper concentration of your cutting and grinding fluids as well as check low concentrated salt and sugar solutions and food content QUALITY & LIGHTWEIGHT: made with the highest and finest quality of aluminum & rubber and features automatic temperature compensation and comes with Portable USB LED Light 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 Item Length and weight: 20cm ; 102g Set Includes: 1 x Traditional Brix and Salinity Refractometer 1 x English Instruction manual 1 x Mini screw driver 1 x Cleaning Cloth 2 x Pipettes 1 x Portable USB LED Light (Power Bank not included in set) 1 x Protective Carrying Case