Features:The weather forecast bottle is made of glass with liquid inside, durable in use.It is used to detect air pressure and it reads the pressure change and predicts the weather change.A very beautiful home decoration and a weather forecast bottle for predicting the next day's weather condition.It not only can be used as a weather forecast bottle, but also can be used as a nice home table decoration.When it's going to rain, the water in the thinner glass tube will be risen up, higher than the water level in the glass ball.When the sunny day, the water in the thinner glass tube will fall back to the same level as the glass ball.A nice gift for your family and friends, suitable for birthday gift, Valentine's Day gift and anniversary gift.Specification:Condition: 100% Brand NewMaterial: GlassColor: BlueSize: Approx. 15cm / 5.9inWeight: Approx. 157g / 5.5 ozInstruction:Put some water in the water-soluble pigment, cover a plastic tube on the injector, fill the injector with the color water, and inject it into the bottle. It takes about three times.Package list:1 * Glass Bottle1 * Pigment1 * Injector1 * Instruction ManualNote:1. Please allow 0-2 cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.