The green LED emits light toward a target in parallel, and project an edge of an object onto the CCD. Then, the CCD collects a light area and a dark area of an image and inspects the edges of the light and dark areas at the same time to obtain a measurement value such as a diameter, a displacement, etc. Unlike the existing principle of clicking and scanning a point notified by laser, this system employs the non-abrasion/high-precision CCD measurement principle to enhance a life of use and precision. Additionally, this system has advantages such as high precision, high measurement efficiency, maintenance of the measured component, data input to a data storage, the best warning functions, etc.