User-friendly microscope excellent for high school students interested in viewing slides. Suitable for grades 8 to 12. Limited 5 year warranty Features: Choice of 45º monocular, 45º dual view, or binocular head, all rotate 360º Dioptre adjustment on the left eye tube Superior quality 10x wide-field eyepiece with calibrated pointer Reverse nosepiece for more working room on stage DIN achromatic objectives are achromatic, color-coded, pacentered, and parfocaled; the 40XR and 100XR are retractable Stage has tension adjustment to virtually eliminate stage drift Positive stops at both ends of stage travel to prevent damage to specimens and optics LED lighting gives exceptionally bright, even light with 10, 000 hours of bulb life Vinyl dustcover and instruction manual included Shipping information: 9" x 6" x 15"-9lbs