Celestron 44100 200x Power Laboratory Biological Microscope A microscope with simple features but yet a serious microscope designed for the budget conscious purchaser 10x eyepiece and a 20x objective lens combine to provide a power of 200x which is ample for beginning usage The arm is adjustable from 0 to 45 so you can position the microscope for comfortable views 42mm (1.7") mirror provides illumination to make details of specimen slides easier to see Plain stage of 88mm x 88mm (3.5" x 3.5") comes with stage clips which hold the slides in place for observing and helps keep them centered