Suunto M4 User Manual page 23

2. Make sure your device receives the HR signal.
en
3. Lie down and relax for three minutes.
4. Check your heart rate from the device and adjust it accordingly in the
.
PERSONAL SETTINGS
TIP: The best time to perform the rest HR test is after a good night's sleep. If
you just had coffee, feel tired or stressed, do the test later.
23