AUTOUTLET Refractometer Saltwater Aquarium for Seawater,Pool,Tank,Testing,Marine Fishkeeping, 0-100PPT & 1.000-1.070 Salinity Tester with ATC Function Hydrometer Specific Gravity Salinity Meter KitBrand: AUTOUTLET Color: Siliver dual Scale Features: AUTOUTLET Salinity RefractometerThis salinity tester is used to measure salinity of brine seawater, monitor and control the concentration of saltwater. Ideal for aquariums and marine applications. Measures on 2 ScalesThis saltwater hydrometer measures on dual scales: specific gravity and salinity. Ideal for aquariums, marine monitoring, agriculture, gardening and educational purposes. Measurement