Aquarium Glass Hydrometer with Salt Marine Salinity Tester Meter

Features: For Salt Water / Marine Aquariums. Easy to use. Measure both Temperature and Specific Gravity of the water. Green indicators are for ideal range of water temperature and specific gravity for most salt water / marine aquariums. Instruction:Place the hydrometer into water, and let it flow freely in the water; If water level below the green indicator means more for fresh water is required; If water level above the green indicator means more salt water is required. Specifications: Material:Glass Color: As the picture shows Size:20cm/7.87" Package Includes: 1 Pc x Aquarium Glass Float Hydrometer With Salt Marine note: 1.Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!