Specifications: Size:app.20cmx1.5cmx8.5cm(Hight x Thick x Width) Specific gravity range: 1.000-1.027 Salinity range: 0-36 Instructions for use: Insert the hydrometer below 15 cm of the water tank or fish pond until the water overflows the baffle. When the water reaches full state, take out the hydrometer and place it on a horizontal surface. Bubbles attached to the needle can cause inaccurate readings. Carefully tap the hydrometer to vibrate the adhering air bubbles. Read the specific gravity on the inner scale and read the salinity (PPT) on the outside scale. It is recommended that the seawater of the seafood pool be between 1.020 and 1.023, which is within the safety line. Cleaning and maintenance: Before the first use of hydrometer, it is recommended that the first filled with water to make it stand for 12 hours, so that the pointer easier go into work status. After each use, wash with water. Salt crystallization in pointer will lead to inaccurate readings, if salt crystallization in the hydrometer, the hydrometer is soaked in lukewarm water or vinegar for 30 minutes, then rinse it dry. Note: Manual measurement, with small error. Please check size in detail before purchase. Real colors may slightly differ from the pictures, as it depends on specific monitor settings and light brightness. We highly appreciate all customers opinions to improve the selling, also if anything you unsatisfied, please contact us for probable best solution. Package Includes: 1Pcs

Proper salinity level is one of the most important factors in the health of the fish.Readable and accuracy can up to ± 0.002 gravity unit. When the water reaches full state (with the top of the baffle level), filed a hydrometer, this product can be hand or hang in the cylinder, automatic level function, can automatically find out the level to avoid the error. Keeping your hands clean,go underwater 15 cm (6 inch) depth to avoid errors caused by inhalation of oil film on the top of water. Special for culture of marine fish, the specific gravity and salinity of seawater are displayed once, easy to use and easy to read. Made of high quality plastic, Withstand voltage,high transparency.

Best Sellers Rank: See Top 100 in Pet Supplies. : B07W4Z719X. Manufacturer: KOOBOOK. Date First Available: August 9, 2019. Package Dimensions: 12.01 x 6.85 x 1.42 inches; 4.09 Ounces.