Easily study for your biology exam at home by practicing using this microscope kit from Celestron. This lightweight scope features a focus knob with powers from 40x to 600x for accurate examinations, and it includes multiple eyepieces for various types of projects. The Objective Lens Size is 4x, 15x, 30x. It’s the perfect tool for discovering and learning about the world we can’t see. A lens-cleaning cloth is also included.