Is Apple watch heart rate variability accurate?

Related questions

1. What is normal range for heart rate variability?
2. How does your Apple Watch know when to tell you to breathe?
3. Is Apple Watch HRV accurate?
4. What is low heart rate variability?
5. Is a heart rate of 110 high?
6. Why is HRV important?
7. What is a good HRV?
8. What causes heart rate variability?
9. Can Apple Watch Do HRV?
10. Can fitbit measure heart rate variability?

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20. #these
21. #simply