The body temperature reading function is one of the great new features of the Apple Watch S8 and Ultra. During the last Keynote, the presentation of this new function took some time … but nevertheless he “forgot” in passing to mention the time necessary for its activation. a document uploaded by Apple indicates that temperature monitoring requires a calibration phase lasting 5 nights!
This (long) duration allows the Apple Watch Series 8 and Ultra to generate a user reference temperature and eliminate the “noises” that go beyond the average value. This data collection is done only at night with the Track Sleep function and the Concentration Rest mode active, and this for a minimum of 4 hours per night. If we can hope that the body temperature reading is as accurate as possible, Apple still hurries to temper by indicating, as it did for the integrated ECG, that the Apple Watch is not a medical device and that in case of doubt it is. it is always better to refer to this good old thermometer …
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