Optional product STEM is an analysis tool used to generate transmission images, on the basis of a table-top ‘Scanning Electron Microscope’ (SEM), by detecting electrons that had been projected onto a specimen in a two-dimensional manner through electron beams generated by an electron gun. This tool allows scholars in the ‘life sciences’ field to observe the information of cells beneath the surface and their structure and, in material science, nanostructures by using its small braille beams and rich luminance.