The crystals ask for 1-2 week to adapt to the environment when you received it. Please put it indoors close to a window to get a best form change. Please don't put it in the place exposed to direct sunlight or in front of air conditioner. Its not 100% accurate but definitey does change from time to time. If you want to see the test result, can place it in the refrigerator frozen half an hour to an hour, then take a look at the change effect. The change more depends on temperature. Instruction manual explains how to figure out the crystals means, here is a synopsis: Snow: The crystalline structures grows like a feather Sunny day and Summer: The crystalline structures will precipitate to the bottom of the bottle Rain and Cloudy days: The crystalline structures will float (change is subtle, not obvious) NOTE: It can not as precise as weather broadcast, it is mainly used as a beautiful glass artwork with the Simply weather forecast. Because the indoor Air Conditioner or Heater or constant temperature conditions will affect it changes or no change. Package Include: - 1x Storm Glass - 1x Wood Base
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