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Heart rate tests automatically on the hour, such as 1:00, 2:00, etc. Total 24 times a day. Or,
press and hold ♥ button for more than 2s until "--" besides "♥" flashes. Release the button. It
starts to test heart rate.
When heart rate exceeds 100bpm, the screen will flash for 10 sec as an indication of high
heart rate warning.
2. Wrist skin temperature
Wrist skin temperature means the temperature on wrist skin. Body temperature varies on
different parts of the body and from person to person and even at different time of the day.
Wrist skin temperature is measured by the temperature sensor. Temperature sensor is usually
a resistive sensor. The resistance changes with the wrist skin temperature. Ideal resistance
changes linearly with the temperature. This linear relationship is used to analyze the wrist skin
temperature.
Same as the heart rate, the wrist skin temperature tests and saves automatically on the hour,
such as 1:00, 2:00, etc. Total 24 times a day. Or, press and hold ♥ button for more than 2s until
"--" besides "♥" flashes. Release the button. It starts to test and save.
Temperature varies on different parts of the body. Head temperature is generally higher than
foot temperature. Take forearm for example. Normally, forearm temperature is 1℃ lower than
axillary temperature. Body temperature can thus be inferred. It is found in a comfortable
environment, the average skin temperature is 33.8℃, with a mean deviation of 0.6℃.To
maintain a comfortable average skin temperature is an important condition to ensure human
thermal comfort.
V. Environment Parameters
1. Wrist humidity
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