barometer accuracy

I was wondering if anyone knew what the actual accuracy of the barometer is in either the apple watch or the newer iphones. I've searched around online and haven't been able to find any detailed technical specs.


Two of the most accurate MEMS pressure sensors are the Bosch BMP388 which has .08 hPa relative accuracy or the even more senstive TDK InvenSense ICP-101x series which has a relative accuracy of .01 hPa which works out to about .1 meter.


It would be nice to know where the iphone / watch fall(s) in comparison.

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sebasmurphy
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What accuracy does your app require?


I think ~ ±1 hPa is a good rule of thumb with current devices.


I also think Apple is currently sourcing from both the manufs. you mention, but last time I heard a chip mentioned it was the BMP280, back in 2017, before they were supposedly looking for a second supplier.

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KMT
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Do the experiment:


https://apps.apple.com/pk/app/barometer-altimeter-pro/id923043780#?platform=appleWatch

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PBK
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