Ayce TRUE BALCK 1.0 Manuel D'utilisation page 135

TO SET RELATIVE ATMOSPHERIC
PRESSURE VALUE
Press and hold the [ BARO ] key for 2 seconds until
1.
"Abs" or "Rel" icon flashes.
Press [ CH / + ] or [ MEM / - ] key to switch to
2.
RELATIVE mode.
3. Press the [ BARO ] key once again until the
RELATIVE atmospheric pressure digit flashes.
Press [ CH / + ] or [ MEM / - ] key to change the value.
4.
5. Press the [ BARO ] key to save and exit the setting
mode.
Note:
The default relative atmospheric pressure value is
1013 hPa (29.92 inHg), which refers to the average
atmospheric pressure.
When you change the relative atmospheric pressure
value, the weather indicators will change along with it.
The relative atmospheric pressure is based on the
sea level, but it will change with the absolute
atmospheric pressure change.
PAST 24 HOURS HISTORYRECORD
The main unit will record past 24 hours weather data of
In / outdoor thermo-hygro & barometric pressure
135 |136
GB