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Welcome to Our Store.Happy shopping! *shopping tips: 🍀Shop Products Are Ready Stock;( Shop Support COD ) 📣📣📣 Products from overseas ,Estimated Ship time is approximately 2-5 days from Order Date,normally it will arrive in about 6-15 working days😘 💞All products in this shop are wholesale prices👍👍👍 💰Full store activity,5-60% off discount💯 💰💰Before ordering,receive coupons,enjoy more benefits (enter the shop home page toreceive)🌹🌹🌹 ✏✏If any shopping problems,please contact our coustomer service,Thanks Specifications: Insert the hydrometer to the water tank or fish pond below 15cm until the water overflows the baffle. When the water reaches the full state, take out the hydrometer and place it on a horizontal surface. Bubbles attached to the needle will result in inaccurate readings. Carefully tap the hydrometer to vibrate the adhering air bubbles. Read the specific gravity according to the inner scale and read the salinity (PPT) according to the outer scale. It is recommended that the seawater of the seafood pool be between 1.020 and 1.023, which is within the safety line. Square type: specific gravity range: 1.000-1.030, salinity range: 0-40. Rinse with water after each use. Type: Seawater Hydrometer Material: Plastic Specific Gravity Range: 1.000-1.030 Salinity Range: 0-40 Size: 9cm x 12cm x 1.5cm/3.54" x 4.72" x 0.59" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Seawater Hydrometer #Aquariums #Aquariumhydrometer #Fish #Pensonco #PetSupplies #Seawater #Tank #Water