User Manual

•
When your heart rate is low, the sensor may not be able to provide stable
readings. A short warm-up of a few minutes before you start the recording helps.
•
Skin pigmentation and tattoos block light and prevent reliable readings from the
optical sensor.
•
The optical sensor may not provide accurate heart rate readings for swimming
activities.
How to wear your watch to improve HR measurements
The accuracy of optical HR measurement is
influenced by a number of factors and it
can dier depending on the person. One of the factors that makes the biggest
dierence is how you wear your watch. The right fit can help improve the accuracy of
your heart rate readings. Start with the following tips, then test and improve the fit of
your watch until you
find your personal optimal spot.
During daily use
Wear your Suunto watch at least 1 finger above your wrist bone and make sure the
watch is snug on your wrist. Your watch should always maintain contact with your skin
so that you can't see the light shining from the sensor.
Suunto 7
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