The best replacement for tester is investor.

The best alternatives to tester are rated as following:
★★★★★  investor
★★★★  developer
★★★  rehberg
★★★  programmer
★★  burns
★★  cologne
★★  test engineer
★★  original perfume
★  qa
★  test analyst
★  business analyst
★  qa engineer
★  multi tester
★  multitester
★  regular cologne
  multimeter
  conrad burns
  loadrunner
  outlet tester
  rational robot
  voltage tester
  continuity tester
  multi meter
  voltmeter
  electrical tester
  v o m

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

Other search terms related to tester and their ratings are:
★★★★★ multimeter
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Google Trends

Scale is based on the average worldwide traffic of tester in all years. Click on graph for more.
tester
investor
developer