Glass Aquarium Hydrometer with Built-in Thermometer Marine Floating Salt Water Salinity Tester 1.000-1.060 7.87in

Features: For Salt Water / Marine Aquariums. Easy to use. Measure both Temperature and Specific Gravity of the water. Green s are for ideal 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 means more for fresh water is required; If water level above the green means more salt water is required. Specifications: Material:Glass Color: As the picture shows Size:20cm/7.87" 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! Package includes: 1 Pc Aquarium Glass Float Hydrometer With Thermometer Salt Marine