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The SQF-L, manufactured by Ivymen Optic System, is a stereo microscope with a changeable magnification using a continuous zoom control, with control knobs on either side to allow parfocal centralized focus. It has been designed for long duration work in biology, botany, archaeology, geology, teaching and electronics. It has a 3-D optical resolution that displays a wide field of view without side aberrations. Furthermore, this product produces clear and crisp contrasts and true colors.