The simplest educational-grade biological microscope, designed for beginners. The microscope is equipped with glass optics. It has three achromatic objectives, providing magnification in the 40-400x range, which can be increased to 640x with the optional P16x eyepiece. This is sufficient for observing most interesting objects, such as plant and animal cells and tissues, protozoa, and planktonic crustaceans in a drop of water.