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When outdoor temperature and humidity are not in the effective calculating range of
humidex, then current outdoor temperature will be displayed instead (the words Heat
Index and Humidex will not be displayed on the screen when Humidex is out of range).
7.0 Heat Stress Index Scale
The Heat Stress Index is a valuable measure of the effect of humidity on how "hot it
feels" . Since our bodies primary cooling mechanism is through perspiration and the
cooling effect of evaporation from our skin; as the humidity increases, there is less
evaporation and we feel hotter.
At a certain point, high Heat Index/Humidex values become a health issue and a
serious one for people who are working or exercising in it.The color LCD scale reflects
the Heat Stress Index values and relates to the health affects outlined below:
Condition
Caution
Extreme Caution
Danger
Extreme Danger
8.0 Wind Chill
Press the Wind Speed/Wind Chill button to switch from wind speed to wind chill on
the monitor.
6
Heat Index /
Humidex Value
27°C to 31°C
80°F to 89°F
32°C to 40°C
90°F to 104°F
41°C to 53°C
105°F to 129°F
54°C/130°F
or higher
Physical Response
• Fatigue possible with prolonged
exposure and physical activity
• Sunstroke, muscle cramps and heat
exhaustion are possible with
prolonged exposure and physical
activity
• Sunstroke, muscle cramps and heat
exhaustion are likely
• Heat stroke possible with prolonged
exposure and physical activity
• Heat stroke and sunstroke likely
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