MoreFit Grace, Руководство пользователя

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Troubleshooting
Heart-rate signal missing
Grace continuously tracks your heart rate while you're exercis-
ing and throughout the day. If the heart-rate sensor on your
watch has difficulty detecting a signal, the green light on the
back of the watch will continue to flash continuously.
Next, please make sure you're wearing your watch correctly,
either by moving it higher or lower on your wrist or by tighten-
ing or loosening the wristband. Grace should be in contact with
your skin.
After holding your arm still and straight for a short time, you
should see your heart rate again.