Philips DL8790 User Manual page 65

Problem Possible cause
In doubt about Direct contact with the skin
accuracy. / can be lost if e.g. the watch
My device is is worn too loosely, when
not measuring the strap is positioned over
correctly. the wrist bone or when
there is a lot of hand/wrist
movement.
Solution
Make sure to position the watch
correctly (see 'Wearing the health
watch') and provide a snug but
comfortable fit. If this does not fix
the issue, try re-positioning the
watch at bit higher up on the arm
or on the other arm. (if you place
the watch on the other arm, do
not forget to change the watch
placement setting in the app).
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