100% brand new and high quality Features: Go underwater 15 cm (6 inch) depth to avoid errors caused by inhalation of oil film on the top of water. Keeping your hands clean to prevent contamination of seawater in the fish tank. Readable and accuracy can up to 0.002 gravity unit. Rugged and durable. Simple and more reliable readings. After each use, wash with water. Cleaning and maintenance: 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: 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. Specification: Material: Plastic Model 028: app.19.5cmx5cmx7.5cm/7.68''x1.97''x2.95'' Model 038: app.21cmx5cmx9cm/8.27''x1.97''x3.54'' Color: Transparent+Blue,As the pictures shown Quantity: 1 Pc Note: 1.Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Hydrometer (without retail package)