Description: 1.Insert the gravity into the tank or the fish pond below 15 cm until thespills the plate. (slowly fillingto prevent bubbles attached to the pointer) 2.When thereaches the full state (and the top level of the baffle), take out the hydrometer and place it on a horizontal surface. 3.The air bubbles attached to the needle will lead to inaccurate reading, carefully pending the gravimeter to shock the adherent bubbles. 4.Read the specific gravity according to the inner scale, and read out the salinity (PPT) according to the outside scale. We recommend that the seadensity of the seafood pool is between 1.020-1.023, that is the safety line. 5.Rinse with cleanafter each use. Specification: The proportion of range: 1.000-1.030 Salinity range: 0-40 Length x Height x Thick: 9*12*15cm/3.5"*4.7"*5.9" Weight: 94 grams Note: 1.the first use of hydrometer, fill the warmand detergent, cleaning theof oil clean inside, can make higher accuracy. 2.Cleaning: salt crystallization on the pointer will cause inaccuracy of reading. If the salt isin the hydrometer, the hydrometer can be soaked in warmor vinegar for 30 minutes, then washed and dried with clean water. Package included: 1 x Hydrometer

It is easy to read and thecan be + (-) 0.001 units of specific gravity. Professional design make it able to get accurate reading when the temperature of theis at 18 degrees -28 degrees. Read the specific gravity according to the inner scale, and read out the salinity (PPT) according to the outside scale. We recommend that the seadensity of the seafood pool is between 1.020-1.023, that is the safety line. The air bubbles attached to the needle will lead to inaccurate reading, carefully pending the gravimeter to shock the adherent bubbles. When thereaches the full state (and the top level of the baffle), take out the hydrometer and place it on a horizontal surface. Insert the gravity into the tank or the fish pond below 15 cm until thespills the plate. (slowly fillingto prevent bubbles attached to the pointer).

Date First Available: March 5, 2018. Best Sellers Rank: #142,242 in Pet Supplies. Customer Reviews: 3.4 out of 5 stars 32 ratings 3.4 out of 5 stars. : B07B4DP45N. Is Discontinued By Manufacturer: ?No. Item model number: ?Yosoo537gtqix12. Country of Origin: ?China. Product Dimensions: ?5.51 x 3.54 x 0.79 inches. Item Weight: ?3.23 ounces.