Sper Scientific 850027 Mini Environmental Quality Meter - Manual (Page 14)

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Use HOLD and to adjust the
location altitude value. When
the location altitude value is set,
pressing REC will show the sea
level barometric pressure value.
button = ▲button
HOLD button = ▼ button
REC button = Enter button
Note...
The sea level barometric
pressure value can not be
saved as a default when the
meter is powered off. When the
meter is powered on again and
bAr is selected the meter will
show the actual air pressure
in the measurement location
(absolute air pressure value).