Samsung CT58 User Manual page 16

Getting started
Use the HR feature only for measuring your heart rate. The accuracy of the
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optical heart rate sensor may be diminished depending on the surroundings,
measurement conditions, and user's physiological state.
As cold ambient temperatures may affect your measurement, keep yourself
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warm when checking your heart rate during winter or cold weather.
Smoking or consuming alcohol before taking measurements may cause your
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heart rate to be different from your normal heart rate.
Do not move, talk, yawn, or breathe deeply while taking heart rate
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measurements. Doing so may cause your heart rate to be recorded inaccurately.
If your heart rate is extremely high or low, the measurement may not be
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accurate.
If measuring children's heart rates, the measurement may not be accurate.
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Users with thin wrists may receive inaccurate heart rate measurements when
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the Fit is loose, causing the light to be reflected unevenly. In this case, wear the
Fit on your inner arm.
If heart rate measurement is not working properly, adjust the position of the
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Fit's optical heart rate sensor to the right, left, up, or down on your wrist, or wear
the Fit on your inner arm so that the sensor is in contact with your skin.
If the optical heart rate sensor is dirty, wipe the sensor and try again. If foreign
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materials prevent the light from reflecting evenly, the measurement may not be
accurate.
The optical heart rate sensor may be affected by tattoos, marks, and hair on the
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wrist you wear your Fit on. These may cause your Fit not to recognise that you are
wearing it, and the Fit's features may not work properly. Therefore, wear your Fit
on a wrist that does not interfere with the Fit's features.
The measurement features may not work properly because of certain factors,
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such as the light from the optical heart rate sensor being blocked, depending
on your skin brightness, blood flow under your skin, and the cleanliness of the
sensor area.
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