The high-quality lenses provide true optical magnification from 40X to 500X with two eyepieces for a wider range. The package includes 25 professionally-prepared slides with a variety of specimens to view. Manufacturered by iQcrew. The World of the Microscope is a beautifully-illustrated book that will help guide first-time users through the history of microscopes and how to perform some experiments right at home. The inverted design lets you view a wider variety of specimens than conventional upright microscopes including standard slides liquids crystals and much more!