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KOOBOOK 1 Pcs Accurate Hydrometer Salinity Meter 1.000-1.027 Salinity Range 0-36 for Aquarium Fish Tank Marine Sea…

Made of high quality plastic, Withstand voltage,high transparency. Special for culture of marine fish, the specific gravity and salinity of seawater are displayed once, easy to use and easy to read. Keeping your hands clean,go underwater 15 cm (6 inch) depth to avoid errors caused by inhalation of oil film on the top of water.