A mechanical device includes a female component having a right-circular cylindrical internal surface and a cylindrical axis, and a first helical recess in the internal surface of the female component. The latch assembly utilizes a locking cylinder as a push-button mechanism in order to release at least a portion of the handle, which then pivots to an extended position where it can be grasped and turned by an operator. According to the embodiment of the present invention, it can improve the accuracy and the success rate of the pattern matching when measuring the line width.