VanGuard 1233CM Brightfield, Phase Contrast Clinical Microscope with Trinocular Head, Halogen Illumination, 10X, 20X, 40X, 100X Magnification, 360 Degree Viewing Angle, Plan Achromatic Phase Type Compound, clinical microscope provides high magnification for biological, diagnostic and educational use in medical and veterinary clinics, universities and industrial laboratories Trinocular viewing configuration, with two heads to ease eye strain and provide a more comprehensive view, and a third head to connect to an external monitor or camera for an alternative viewing option Magnification ability of 10X (0.25 NA), 20X (0.40 NA), 40X (0.60 NA), and 100X (1.25 NA) (oil immersion method) for a variety of resolvant options 20-watt variable quartz halogen lighting with Brightfield, phase contrast, and integrated Koehler illumination for brightness control Plan achromatic lenses correct for red and yellow chromatic aberrations and sharpen images