Measures the concentration of dissolved salt in fluids. Compact size, easy to operate. Automatic Temperature Compensation (ATC) from 10 to 30°C. Comes with case, calibration screwdriver, plastic pipette calibration solution, and user guide. Features: Compact size, easy to operateAutomatic Temperature Compensation (ATC) from 10 to 30°CProvides accurate and repeatable measurements on easy to read scaleRequires only 2 or 3 drops of solutionThe prism and lens with a simple focus adjustmentComplete with case, calibration screwdriver, plastic pipette and calibration solution