3 ms·
Some of those things stop working correctly when your skin gets damp. Think about that for a second. An iWatch is not the pinnacle of wrist biometrics, however
by ip26 8y ago
Some of those things stop working correctly when your skin gets damp. Think about that for a second.
An iWatch is not the pinnacle of wrist biometrics, however. I'd be a lot more concerned if a high end Garmin got it wrong, that's their whole business.
- nradov 8y agoGarmin and Apple wearable devices use basically the same optical heart rate sensors. They don't make their own. Every company in the industry buys from the same couple of suppliers which have developed the technology.
- pc86 8y agoPart of how you're supposed to use the dedicated higher-end models (I have a Garmin Forerunner 645) is that it's supposed to be pretty tight against your wrist. Even if you "wear your watch tight" it's probably not as tight as you're supposed to wear it for fitness purposes. If at any point you can't feel it or you forget you're wearing it, it's definitely not tight enough. This helps limit optical issues with movement but also largely eliminates the impact of sweat on the reading. Still not nearly as accurate as the chest-based models as mentioned elsewhere, but for 95% of people it's plenty.