But I had the same problem with the second watch too, so if someone is looking for a reliable heart rate monitor, I would not recommend this watch

This watch is really a poor heart rate monitor.

i compared wrist heart rate on the 35 with gym meters and my high quality timex chest strap and watch.the 35 has a great wrist based heart rate monitor! wear it up the forearm a little further than you would normally would and for me accuracy went to 100 percent

The heart rate on the wrist is ideal for watching your heart rate during workouts, and the Bluetooth connection to your phone to easily analyse runs/workouts is extremely helpful