This document describes the components and capabilities of Leeuwenhoek's microscope, including its coarse and fine adjustments, electrical components like a potentiometer and switch, light emitting diode and resistor, multiple lenses, and its use observing specimens such as mosquito larvae, common flies, a cat's lung, paramecios, volvoxes, feathers, onion root mitosis, saliva gland chromosomes, and lily meiosis.