["brand new and high quality \r\nFeatures:\r\nGo underwater 15 for cm (6 inch) depth to avoid errors caused by inhalation of oil film on the top of water.\r\nKeeping your hands clean to prevent contamination of seawater in the fish for tank.\r\nReadable and accuracy can up to ± 0.002 gravity unit.\r\nRugged and durable.\r\nSimple and more reliable readings.\r\nAfter each use, wash with water.\r\n\r\nCleaning and maintenance: \r\nSalt 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\r\n\r\nNote: \r\nbefore 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.\r\n\r\nSpecification:\r\nMaterial: Plastic\r\nModel 028: app.19.5cmx5cmx7.5cm/7.68''x1.97''x2.95''\r\nModel 038: app.21cmx5cmx9cm/8.27''x1.97''x3.54''\r\nColor: Transparent+Blue,As the pictures shown\r\nQuantity: 1 Pc\r\nNote: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid.\r\n 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!\r\n\r\nPackage includes:\r\n1 x Hydrometer (without retail package)"]