The best replacement for micrometer is caliper.

The best alternatives to micrometer are rated as following:
★★★★★  caliper
★★★★  micron
★★★  nanometer
★★★  millimeter
★★★  vernier caliper
★  nanometer bigger
★  vernier
★  1 millimeter
  microinch
  digital caliper
  mesh
  caliper reloading
  calipers
  dial caliper
  millimeter bigger

Your alternative for micrometer is not listed? Suggest!
Speaking about micrometer, one probably shouldn't forget about dial gauge.

Other search terms related to micrometer and their ratings are:
★★★★★ dial gauge
★★★ gauge
You have in mind a companion for micrometer and it is not yet here? Propose!



Google Trends

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micrometer
caliper
micron