The best replacement for pulse oximeter is arterial blood gases.


The best alternatives to pulse oximeter are rated as following:
★★★★★  arterial blood gases
★★  co-oximeter
★★  heart rate monitor
★  abg
★  co oximeter

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Speaking about pulse oximeter, one probably shouldn't forget about blood pressure monitor.

Other search terms related to pulse oximeter and their ratings are:

★★★★★ blood pressure monitor
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Google Trends

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pulse oximeter
arterial blood gases
co-oximeter