The best replacement for electron microscope is light microscope.

The best alternatives to electron microscope are rated as following:
★★★★★  light microscope
★★★★  compound microscope
★★★  transmission electron microscope
★★★  scanning electron microscope
★★★  optical microscope
★★★  compound light microscope
★★  light
★  scanning tunneling microscope
  compound
  scanning electron
  electron microscope
  tem
  scanning
  transmission
  dissecting microscope

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Speaking about electron microscope, one probably shouldn't forget about magnification.

Other search terms related to electron microscope and their ratings are:
★★★★★ magnification
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electron microscope
light microscope
compound microscope