At first, it was developed to install it for the recognition of semiconductor-fabrication equipment, but now it is used from the design and the practicality without the uselessness in various types of business. Projecting onto the monitor by installing CCD camera to replace the stereomicroscope and observing it have become general. An optical magnification of the lens is 0.5 × 〜 5 × usually. As for an integrated magnification, use by 22 × 〜 220 × is liked. It is possible to correspond to various magnifications by the customer's demand.