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This design of weight scale is made up of two parts, trample part and extrusion part are both elastic material.In no pressure condition,the weight scale will not have a “bubble” out, with the increasing of weight, more and more gas under pressure was transferred from the trample part into extrusion part, "bubble" is blowing up, the scale exposed more and more, according to the scale can read out your weight easily,It’s both practical and interesting.
Tianjin University of Commerce