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精确的尺子 / Precision ruler

精确的尺子
精确的尺子

A rounded cut out at the back of the ruler . Convenient
ruler to get up close to the destop .
We often use a ruler when deliberately with the
pen tip to pinpoint "0"scale , sometimes find not precise, but you can be the front end of the ruler out a small piece , and then rely on the nip up, you can accurately find very accurate , and very convenient . A rounded cat out at the back of the ruler , convenient ruler to get up close to the destop .

University

East china jiao tong university

East china jiao tong university
Nanchang city, China

Design

East china jiaotong university

East china jiaotong university
nanchang jiangxi, China

Wenyu Hu Junbin Liu Shuai Zhang Yuecen Han