Best external heart rate monitors for iPhone and Apple WatchWhat external heart rate monitor should you get for your Apple Watch or iPhone?
Updated April 27 2017: Added fitness testing for our picks, and updated our Polar pick to the H10.
The Apple Watch has an excellent oximeter-based heart rate monitor for tracking your day and basic workouts, but it's not perfect for more endurance or weight-based activities.
For one thing, that monitoring comes at the expense of battery life: The smartwatch's health sensors account for a large majority of battery drain; as such, Apple limits how often the sensor records data, even during workouts. At rest, you'll get heart rate data every ten minutes; during a workout, you're likely to get recordings every 10 seconds to a minute.
The wrist-based monitor can also get tripped up if you tend to do a lot of exercises involving wrist bending or quick movement — the oximeter works by measuring the movement of your blood using light, and when you flex your wrist, you can momentarily change that ci...
Source:
Best external heart rate monitors for iPhone and Apple Watch
