Accurate Hydrometer For Aquarium Marine Sea Saltwater

Feature: \n 1. Accurate, durable, and easy to read sea water hydrometer\n2. This product is designed with an automatic level function, can automatically identify the level to avoid errors\n3. Very accurate measurement readings, please rest assured to purchase\n4. And each hydrometer has a engraved patent number\n5. Fit for brackish and marine aquariums. Perfect for testing both salinity and specific gravity of your brackish and marine tanks. \n\nSpecification: \nDescription:\n\nSize: 9*12cm\n\nFeature:\n\n--\n\nAccurate, durable, and easy to read sea water hydrometer. \n\n--\n\nThis product is designed with an automatic level function, can automatically identify the level to avoid errors. \n\n--\n\nVery accurate measurement readings, please rest assured to purchase. \n\n--\n\nAnd each hydrometer has a engraved patent number. \n\nNote: \n\nFit for warm water aquarium (20\u00B0C -30\u00B0C).\n\nTemperature changes will cause the reading changes.\n\nThe accuracy of unit proportio: