- is the watch waterproof (for swimming)?
- can I connect the watch to my Polar H10 chest strap? If so, does the watch indicate whether it measures via the sensor or the chest strap?
- can I import the data directly or via an app into Apple Health?

Question

Accepted Answer

The watch is waterproof and can record swimming activities.
The sensor cannot be connected to the app. 
Fitbit does not support direct synchronisation with Apple Health. However, the data can be synchronised with the additional app "Sync Solver for Fitbit".

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Question about Fitbit Versa 2

- is the watch waterproof (for swimming)? - can I connect the watch to my Polar H10 chest strap? If so, does the watch indicate whether it measures via the sensor or the chest strap? - can I import the data directly or via an app into Apple Health?