Heart rate is not accurate at all.

[zsanford]

I've had Fitbit products before but this thing is dangerously inaccurate. It says my resting HR is between 41 and 45. It's not, with a simple manual check or o2 sensor check, it's at least 10 beats higher. Then I use it at the gym, it's reading 120 to 150 BPM... Yet I'm not even breaking a sweat and I check it manually and it's around 80 to 85 BPM. This thing is terrible and a waste of money. So disappointed. Going to spend the extra money and go to Garmin. 

[Guy_]

Hi @zsanford - the heart rate sensor on this watch does have problems capturing an accurate HR during repetitive movements but is generally more accurate at rest. If you want more accurate HR your decision is probably a good one.