Asus VivoWatch SP User Manual page 29

Heart rate screen
This screen shows your current heart rate. The PPG sensor on your ASUS
VivoWatch SP automatically determines your current heart rate.
To get more accurate results:
1. Wear the ASUS VivoWatch SP in a normal way with the watch face
facing up, the bottom of the ASUS VivoWatch SP touching your skin,
and the ASUS VivoWatch SP away from your wrist bone.
2. Wear your ASUS VivoWatch SP in a way without being uncomfortable.
Do not strap the ASUS VivoWatch SP too tight to your wrist.
3. You can get the most accurate results from the heart rate monitor
when you are warmed up.
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