货号产品型号测量范围分度值用途NR.TypeRangeResolutionUsage642-011XSG0～4mm0.01mm　　用来检验消失螺纹根部以保证外螺纹有足够的长度并且确为接近消失点螺纹　　MeasuringtheconditionofDeviatingtrapezoidscrewtomakesureenoughlengthofouterscrewandknowingthatthescrewisthescrewgauge.642-012JTG 2mm0.01mm　　用于测量油管、套管、接箍螺纹的轴线与中心轴线间的同轴度偏差　　Measurethecoaxialvariationbetweenthecentralaxisandtheconnectingscrewofcannulaandvitta.642-010CKY光学系统放大倍率25.6 Magnifyingpowerofspecscopy25.6 　　用于螺纹牙型半角的测量　　Measurethehalfscrewangleofouterscrew.