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可以放大的尺子 / The ruler can enlarge

可以放大的尺子

The ruler added a magnifier, you can see the number at a distanc with it. According
to use this kind of ruler, we can protect the back and eyes effectively.

University

Zhengzhou University of Light Industry

Zhengzhou University of Light Industry
Hennan ,Zhengzhou, China

Yuli Lei,
Zhengzhou University of Light Industry

Yansheng Xia,
Zhengzhou University of Light Industry

Houqi Zhang,
Zhengzhou University of Light Industry