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Checking whether the clothes hanging outside on the balcony are dry or not in a extremely hot summer day or a chill winter day is rather a suffering. This design changes our traditional way of judging dry and damp from the sense of hand touch into the sense of sight. Its key principle lies in the wet sensitive color changed material. It displayed achromatic when it is dry, while dampened it will appears blue. The gradual change of the color will show you the process of dry. Of course, this smart tag is set on the lower end where is the latest part becomes dry.