Fluorescence microscopes are used to observe certain parts of living cells and tissues with the aid of fluorophores. One or more fluorophores are added to certain parts of the tissue or cells of the sample. When exposed to so-called "excitation light", the fluorophore absorbs energy from the excitation light and emits light at another visible wavelength. This makes it possible to distinguish tumor cells from other cells, in order to demonstrate the presence or absence of antibodies or to observe sub-microscopic cell and tissue structures. Euromex fluorescence microscopes are manufactured with incident light source, special objectives, set of excitation and emission filters and two-color mirror.