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Cloud is a weight scale,which adopts the shape of the clouds and is similarly based on the principle of maglev train.It is equipped with an electromagnet depengding on the magnetic force to be suspended in the cloudlike iron plate below.It works by people standing on the cloud to reflect the weight.the greater the weight,the greater the magnetic force,and the higher the rise of the iron plate.The half crescent shaped screen above the cloud rises higher like the thermometer and finally displays the specific weight.there is also a corresponding app in the cloud,you can input your height and get your bmi and health curve.