The Motic C20 provides users with a professional microscope at a reasonable price, including a dust cover and immersion oil. Key Features: Infinity optical system, 160 mm Binocular observation tube, Siedentopf Interpupillary distance 55-75 mm +/- 5 diopter 30-degree inclination, 360-degree rotation WF10X/18 mm eyepiece Quadruple revolving nosepiece with click stops 4X/0.10, 10X/0.25, 40X/0.65/S, 100X/1.25/S-oil W 4/5" × 1/36" lens mounting thread (RMS standard) Built-in low-position mechanical stage with specimen holder Adjustable upper stop Coarse and fine focusing system with tension adjustment Blue filter 12V/20W LED illumination with intensity control Dimensions: 47 × 38 × 26 cm