The Parco EZ-250 beginner microscope is ideal for first microscope experiences! This entry level microscope features a tamper proof viewing tube and shock resistant stand for enhanced durability in classroom settings. It also features Achromatic ground and polished glass lenses for superior image resolution and clarity and a permanently attached reversible mirror - concave on one side, white surface on the other to direct natural light onto the specimen. Rotating the optical tube brings specimen into focus and moving the eyepiece tube up and down will move through the zoom range from 25X to 100X. A great microscope for young students to get them interested in science! 1 year limited warranty.