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6. Press the UP or DOWN button to switch to RELATIVE mode.
7. Press the BARO button again, and the number for RELATIVE flashes.
8. Press UP or DOWN button to change the value.
9. Press the BARO button to save and exit the setting mode.
NOTE
10. The default relative atmospheric pressure value is 1013 mb/hPa (29.91 inHg), which refers to the
average atmospheric pressure.
11. When you change the relative atmospheric pressure value, the weather indicators will change
along with it.
12. The built-in barometer can notice the environmental absolute atmospheric pressure changes.
Based on the data collected, it can predict the weather conditions in the forthcoming 12 hours.
Therefore, the weather indicators will change according to the detected absolute atmospheric
pressure after you operate the clock for 1 hour.
13. The relative atmospheric pressure is based on the sea level, but it will change with the absolute at-
mospheric pressure changes after operating the clock for 1 hour.
22 Heat index
Press the INDEX button several times until HEAT INDEX is displayed.
Heat index
Warning
Meaning
> 55° C
(> 130° F)
Extreme danger
Strong risk of dehydration / sun
stroke
41° C – 54° C
(106° F – 129° F)
Danger
Heat exhaustion likely
33° C – 40° C
(91° F – 105° F)
Extreme caution
Possibility of dehydration
27° C – 32° C
(80° F – 90° F)
Caution
Possibility of heat exhaustion
Notice:
The perceived temperature is based on the common effects of temperature and humidity. Heat index
is only calculated when room temperature is at 27° (80° F) or higher. The displayed perceived temper-
ature is calculated solely from temperature and humidity and is measured by the outdoor sensor.
23 Dew point
Press the INDEX button several times until DEW POINT is displayed.
Note:
The dew point is the temperature below which the water vapor in air at constant barometric pressure
condenses into liquid water at the same rate at which it evaporates. The condensed water is called
dew when it forms on a solid surface. The dewpoint temperature is calculated from the indoor temper-
ature and humidity measured at the main unit.
24 History record for the past 24 hours
The base station automatically records and displays data of the past 24 hours.
1. Press the HISTORY button to check history records of the last hour.
