CapitolBrand M3504-1F Borosilicate Glass Standard Grade Microscope Slides, Frosted on One End, 3" Length x 1" Width x 1mm Thick (Box of 72) Compound microscope provides high magnification for biological use and educational applications Monocular viewing head with locked-in 18mm 10x widefield eyepiece with pointer and fixed 45-degree vertical inclination to reduce eye and neck strain Forward-facing nosepiece and 4x, 10x, and 40xR (retractable) DIN achromatic objectives that provide color correction of magnified images Brightfield, LED illumination and 0.65 NA condenser with iris diaphragm and dimmer for clear examination and light control Plain stage with clips secures slide in place, and separate coarse and fine focus knobs speed focusing