I had a fitbit with Heart rate monitor - I no longer use it.
I was obsessing too much, checking my heart rate frequently - gave it up.
I now use my iphone 6 as a step tracker - its easier for me.
Fitbit is over rated - over hyped in my opinion.
I have one fitbit hr. When i squated, it can’t show my heart rate.
I spent two weeks in the hospital comparing the heart rate on my Fitbit to the heartrate on the expensive monitor. It was always bang on. Always – even during the stress test.