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After using a tape measure in the usual, do tokens, with one hand hold the tape measure, marker in hand with the other location marking, and, marked by a certain error. So I designed a marked ruler can do. When the amount you want to mark the place to do when the sign outside the tape device hands down one click, you make a mark. Also, there is no error, effort and save trouble.
Jiangxi University of Finance and Economics
NanChang City,Jiangxi Province, China
Jiangxi University of Finance and Economics
NanChang City,Jiangxi Province, China
Jiangxi University of Finance and Economics
NanChang City,Jiangxi Province, China
Hongxing Xiang
Shirong Wang
Yan Chen
Yaosheng Mao