AmScope 40X-1000X Glass Optics All-Metal Frame Student Compound Microscope + Book 360 degree rotatable monocular head offers five magnifications 40X-100X-250X-400X-1000X Single lens condenser with disc diaphragm Cordless LED illumination uses either an outlet or batteries Sturdy all-metal framework and all optical glass lenses Microscope book: The World of The Microscope