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“Spring Scale” is a weight scale which can enlarge its length to fit the object. Measuring the weight of big objects are always difficult, the objects like luggages may be too long to fit in the scale, so “Spring Scale” make it more easily to measure by enlongate the body like a spring.
National Cheng Kung University
Tainan, Taiwan
National Cheng Kung University
Tainan, Taiwan
Che-Yu Lu