This is a phase contrast and brightfield digital biological microscope that provides options for observing live cells depending on your applications. A complete set of phase contrast kit can be flexibly equipped with ordinary biological microscope to be a phase contrast microscope system. The phase contrast laboratory microscope can improve the images of transparent and colorless objects, which are hard to see or invisible in an ordinary microscope. This phase contrast and brightfield laboratory binocular microscope comes with a 30° inclined 360° swiveling compensation free binocular viewing head, quintuple reversed Siedentopf nosepiece, four PLAN objectives, large double layer mechanical stage, variable intensity halogen transmitted illumination system, a set of phase contrast kit, and a digital imaging system. The brightfield Siedentopf compound microscopy offers eight levels of brightfield magnification from 40X-1600X. The phase contrast kit includes a phase contrast NA1.25 condenser, a centering telescopic eyepiece, three achromatic phase contrast objectives with phase plate: 10X, 40X, 100X. The phase contrast biological microscope offers six levels of magnification power: 100X-160X-400X-640X-1000X-1600X. The 9.0MP (3488x2616 pixels) USB digital imaging system that captures microscope images and live video on computer. The included software compatible with Windows XP/Vista/7/8/10 can be used to make measurements. There is a wide range of accessories available including darkfield condenser and carrying case. This type of microscopy is widely used in universities and life science professionals.