Before revision: SEMs are different from TEMs in that they use electrons with much lower energy, generally below 20 kV , while TEMs generally use electrons with energies in the range of 80-300 kV .
After revision: SEMs are different from TEMs in that they use electrons with much lower energy, generally below 20 keV , while TEMs generally use electrons with energies in the range of 80-300 keV .