The biological microscope can be used in medical and hy-giene setablishment, laboratory, research institute, and college for biology, pathology, bacteriology observation, teaching and professional research clinical test and routine medical inspection. Adopting many new sturcture and new technology, 603699-212 microscope has an advanced design, new outlook which make the operators to use the miscroscope conveniently and safely. This microscope can also be used with many accessories to realize dark field, phase contrast, photographic and CCTV function.