Celestron 44102 400x Power Laboratory Biological Microscope Feature-packed entry-level biological microscope at an economical price, with five prepared slides included 10x eyepiece and 4x, 10x, and 40x objective lenses combine to provide powers of 40x, 100x, and 400x Fully coated glass optics, all-metal body with monocular head, 5-poisition disc diaphragm 50 mm (2") mirror provides illumination, while a basic condenser concentrates light onto the specimen Adjustable arm (0 to 60) for comfortable viewing, coarse and fine focus knobs