Descirption:100% and high qualityFeatures:For salt water marine aquariums. Can be used in mariculture and other places.Built-in thermometer, measure both temperature and salinity of the water.Green indicators are ideal range of water temperature and specific gravity for most salt water aquariums.Easy to use: Place the hydrometer into water, and let it flow freely in the water.There are two sizes. L is about 26.5 cm/10.43 inches in length, S is about 20 cm/7.87 inches in lenght. Measuring range 1.000-1.040. Temperature range 0-40/32-104.Specifications:Material: GlassColor: TransparentLength:S-Approx.20cm/7.87inL--Approx.26.5cm/10.43inWeight:S-Approx.40gL-Approx.60gMeasuring Range: 1.000-1.040Temperature Range: 0-40/32-104.Notes:1.Please allow 0-1cm 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 Aquarium Hydrometer (S/L)