100BD Industry checking and measure microscopes are suitable to observe surfaces structure and geometry of work piece. It is equipped excellent UIS optical system and modularization function design so that update system expediently and achieved polarization, dark field observation. Lift or down the optical and illumination unit along the leader to adjust the distance from stage to objective, so that enable using for different thickness work piece. Quickly and effectively locate the observation part of work piece by moving the mechanical stage. The motion of the focusing is roll that the roller bearing moved guiding the trigon, so that the moving process is smooth. This is ideal optical instrument for checking and measure in the field of precision part, integrated circuit, packing material etc.