Which technology or industry originally inspired the development of the modern pulse oximeter, the fingertip device that measures blood oxygen levels?

Product design in medicine has often been shaped by unexpected innovations and cross-industry inspiration. This poll explores how one of today's most essential medical monitoring tools came to be. Test your knowledge about the fascinating evolution of medical product design that has saved countless lives in operating rooms, emergency departments, and now even in homes worldwide.

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Aviation technology for high-altitude pilot monitoring
Color-sensing technology from the photography industry
Spectroscopy techniques from the mining industry
Sonar technology adapted from submarine detection systems