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Coming from a FitBit Charge 6, I'm a bit disappointed in the AW S11 heart sensor. It takes a while to get a reading while it's "measuring", whereas the FitBit is always reading your heart rate and displays it on the face. It seems to be accurate, it matches the Fitbit bar a difference or a beat or two. When taking a measurement, it seems to take a few seconds for a consistent read to come through as well. It's like it starts off a bit erratic and then settles down.
 
Coming from a FitBit Charge 6, I'm a bit disappointed in the AW S11 heart sensor. It takes a while to get a reading while it's "measuring", whereas the FitBit is always reading your heart rate and displays it on the face. It seems to be accurate, it matches the Fitbit bar a difference or a beat or two. When taking a measurement, it seems to take a few seconds for a consistent read to come through as well. It's like it starts off a bit erratic and then settles down.

Never been a fan of Apple’s HR sensor. Not just the S11 but years back. Everyone tells me that it is the nature of the sensor. Cold is the worst as capillaries constrict under the skin, in cold, to protect the body core. The AW is being asked to multitask while the Polar has only a single one.

This polar device uses the same principle as the Apple Watches, except there are 6 very bright green LEDs surrounding the sensor. After multiple workouts, I am finding it to be bulletproof.
 
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Another observation. When in a workout the Polar over rules the built in sensor in the AW. If fact, when the Polar connects, the Apple Watch shuts it’s HR sensor down completely
 
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