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Problem Possible cause Solution
Transmittance of light through the
skin can be inuenced by stark
contrast in pigmentation of the skin
(e.g. due to a pattern in a tattoo).
This could result in inaccurate
optical heart rate measurement.
Try re-positioning the watch at bit
higher up on the wrist or on the
other wrist (if you place the watch
on the other arm, do not forget
to change the watch placement
setting in the app).
The strap of
the watch is
too small or
too large for
my wrist.
You are using the wrong strap size Change the strap of the watch
with th extra strap supplied
(See ‘Changing the strap’)
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