The instrument used in studying cells is called a microscope. Microscopes are used to magnify small objects, allowing scientists to observe the structure and function of cells. There are many different types of microscopes, each with its own advantages and disadvantages. The most common type of microscope is the optical microscope, which uses visible light to magnify objects. Optical microscopes can magnify objects up to 1,000 times. Another type of microscope is the electron microscope, which uses a beam of electrons to magnify objects. Electron microscopes can magnify objects up to 1 million times.