Description The item is a floating hydrometer. This product is constructed with glass material for long-lasting and practical use, which can directly with water but bring no odor into water. It offers accurate measurements. This hydrometer can be widely used in fish tank and aquarium . Feature - Color: As shown - Material: Glass - Size: About 20x1.3x1.3cm. - Test Range: 0-40 1.000-1.060. - Made of premium glass material which can directly with water. - Placed in any corner of the fish tank, floating design, automatic temperature/salinity testing. - It is convenient to test the specific gravity and temperature of water. - In the aquarium, it is convenient to measure the specific gravity of the sea water and provide convenience for raising fish. - It is easy to use and suitable for fish tank and aquarium.Package list: 2 x Hydrometer