The best replacement for caliper is micrometer.

The best alternatives to caliper are rated as following:
★★★★★  micrometer
★★★★★  caliber
★★  micrometer caliper
★★  vernier caliper
★★  hook release
★  cantilever
★  v brakes
★  vernier
★  ruler
★  disc brakes
★  dbh
★  hose
★  meter stick
★  double caliper release
★  jmh
★  wheel cylinder
★  calliper
  brake hose
  caliper
  v brake
  canti brakes
  fixed caliper
  master cylinder
  disc brake

Your alternative for caliper is not listed? Suggest!
Speaking about caliper, one probably shouldn't forget about pads.

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



Google Trends

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caliper
micrometer
caliber