I've been wanting to get one of these for my sons for years, but could not find a good price. It's a small book (3 mm thick approx 10 in. long, but filled with a lot of info. Bright line-drawn true to life drawings and detailed instruction for each experiment-- also includes history of microscope, size scale chart, it covers magnifying glasses, instruction on how to use a microscope, easier to harder projects covering the plant, animal and mineral world. Step by step instruction on how to prepare a slide and a list of equipment and supplies. There a more advance application out there, but this is a great way to get any age group (children to adults) basic hands-on experience with a microscope.