The best replacement for tem is sem.

The best alternatives to tem are rated as following:
★★★★★  sem
★★  sem microscope
★★  stem
★  plm
★  pcm
★  light microscope
★  têm
★  sem resolution
★  sem microscopes
  sem microscopy
  lm
  sem electron microscope

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Speaking about tem, one probably shouldn't forget about eds.

Other search terms related to tem and their ratings are:
★★★★★ eds
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tem
sem
sem microscope