The examining parts are poured in the step sponsor. The step sponsor transports the examining parts to a conveyer belt. On the conveyer belt the examining parts are pre-isolated once and held in every station by means of stopper in position. Below the camera the examining parts are dug up and moved into rotation. During the rotation the examining parts are checked by the camera on before agreed attributes. The investment price increase sends a signal according to the classification and situation position of the examining parts to the laser control. The good parts will be push in a slide adjustable in the width. The bad parts are collected at the tape end.