Easy to Read and Use:The easy-to-read swing-arm pointer and extra wide stable base provide an accurate test result. Wide Usage:Fit for brackish and marine aquariums.Perfect for testing both salinity and specific gravity of your brackish and marine tank.Includes solinity and specific grovity scales.Suitable for fresh water and sea water. Clearly Safe Zone Indicated:Includes solinity and specific grovity scales.The outside rang of scale indicates salinity(PPT).The inside range of scale indicates gravity.And with safe zone clearly indicated.Range of use: 0-40 degrees (1.000-1.030).If the salinity ppt between 32 - 40,show that the salinity hydrometer is high;If the salinity ppt between 27 - 31,show that the salinity hydrometer is normal; If the salinity ppt between 0 - 26,show that the salinity hydrometer is light. Durable Clear Acrylic:Accurate, durable, and easy to read your marine aquarium's salt level and specific gravity,Small and waterproof.if the specific gravity between 1.000 - 1.019,show that the specific gravity is small;if the specific gravity between 1.020 - 1.023,show that the specific gravity is nomal;if the specific gravity between 1.024 - 1.030,show that the specific gravity is big;. Safe Material:Made of plastic,aquarium clear Automatic Accurate Readable SaltWater Hydrometer.

Best Sellers Rank: See Top 100 in Pet Supplies. : B07R1TVRKF. Manufacturer: Abnaok. Date First Available: June 28, 2019. Package Dimensions: 8.94 x 5.24 x 0.83 inches; 3.56 Ounces.