The best replacement for stethoscope is doppler.

The best alternatives to stethoscope are rated as following:
★★★★★  doppler
★★★★  fetoscope
★★★  ultrasound
★★  phonendoscope
★★  ekg
★★  littman
★  littmann
★  mdf
  single head stethoscope
  bell

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

Other search terms related to stethoscope and their ratings are:
★★★★★ cuff
★★★★★ blood pressure cuff
You have in mind a companion for stethoscope and it is not yet here? Propose!



Google Trends

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stethoscope
doppler
fetoscope