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Earphone is a carry-on item, but the tape is not.This design adds scales on the earphone surface and combines with the soft material of earphone so that we can measure whenever and wherever possible.It can not only achieve a complex multi-use but also do not need to add any additional cost and structure too much.The material characteristic of earphone,just like tape, is convenient for us to measure the size of all kinds of shapes.If we are in urgent need of tape, no longer need to use hand gestures and no concept of length.
Xi'an University of Technology