Original: Also in 1937 , Manfred von Ardenne pioneered the scanning electron microscope . The first practical electron microscope was constructed in 1938 , at the University of Toronto , by Eli Franklin Burton and students Cecil Hall , James Hillier , and Albert Prebus ; and Siemens produced the first commercial Transmission Electron Microscope ( TEM ) in 1939 .
Simplified: There are several major types of electron microscope , such as : Transmission Electron Microscope ( TEM ) , Reflection Electron Microscope ( REM ) , Scanning Electron Microscope ( SEM ) , Scanning Transmission Electron Microscope ( STEM ) , and others .