http://wenku.baidu.com/link?url=v2XfFaRwoa3bmLHt-z_qg5PJ2Bk0UuE9oxgIRbAEGAr33xdrN2ZvcP8gURwfrqvx_FAEklVZ-I1kboiwWJC7JV7G9-_5NJVqve691PUGnzK看看国标《GB/T6316-1996》齿厚游标卡尺
