The best replacement for indicator is measure.

The best alternatives to indicator are rated as following:
★★★★★  measure
★★★★★  indication
★★★★  ph meter
★★★  metric
★★★  blinker
★★  lagging indicator
★  flag
★  phenolphthalein
★  litmus
★  tournament shark
★  outcome
★  integrator
★  oscillator
★  reagent
★  test indicator
  expert advisor
  ph scale
  holdem indicator
  risk factor
  criteria
  turn coordinator
  pressure gauge
  phenolphthalein indicator

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Speaking about indicator, one probably shouldn't forget about magnetic base.

Other search terms related to indicator and their ratings are:
★★★★★ magnetic base
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