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The Diameter of Ruler / The Diameter of Ruler

The Diameter of Ruler

Rulers are the first scientific measuring tool for hunmansto use,
which make possible our exploration in length.However ,practically ,we hawe troubles calibrating both the inner and outer diameters of a certain object.
Now,the Diameter of Ruler comes in,which can solve this problem by applying a simple principle.It is the new-brand tool that makes our life more convenient.

University

Zhejiang University of Technology

Zhejiang University of Technology
Zhejiang Hangzhou, China

Design

Zhejiang University of Technology

Zhejiang University of Technology
Zhejiang Hangzhou, China

Yangbo shen Xiaoyan zhou xiaoyan shen