Ample Scientific CM401 Nexcope Achromatic Semi-Plan 40X Objectives Advanced Educational Binocular Microscope, 4X10X100X Magnification Biological microscope provides high magnification for advanced educational, medical, and veterinary diagnostic medicine applications, and for universities and industrial laboratories Binocular viewing heads ease eye strain and provide a more comprehensive view, and rotate 360 degrees on two axes 4X, 10X, and 40X (sealed) and 100X (oil immersion method) objectives provide a variety of magnification 3-watt LED illumination provides cool, white light at 6,000 kelvin, with dimmer switch for lighting adjustment capabilities, built-in 1.25 numerical aperture (NA) Abbe sealed condenser for high resolution, and achromatic lenses to correct for color aberrations One year limited warranty