Which pioneering scientific product was initially rejected by its target market because physicians feared it would make their diagnostic skills obsolete, before becoming a standard tool used in nearly every hospital worldwide?

The scientific industry has produced some of the most revolutionary commercial products that have changed our lives forever. Behind many of these innovations are fascinating corporate histories and development stories that few people know. This trivia question explores a famous scientific product that transformed its industry and created a new market paradigm. Test your knowledge of scientific product history!

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The CT scanner, developed by EMI (whose primary business was music records) using Beatles album profits
The pulse oximeter, originally developed by Hewlett-Packard as a photography tool before being repurposed for medical use
The automatic external defibrillator (AED), first created by IBM as a computer power regulation technology
The digital thermometer, invented by Texas Instruments as a failed consumer electronics product before medical adoption