Sper Scientific 850027 Mini Environmental Quality Meter - Manual (Page 16)

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Using HOLD and adjust the
altitude value. When the desired
start location altitude value is set,
press REC to save the setting
value as the default.
button = ▲button
HOLD button = ▼ button
REC button = Enter button
Note....
You can obtain your altitude
value from a topographical map
or local landmark. Google Earth
is an excellent free program
that provides the exact altitude
for a given address: www.earth.
google.com. You can also get the
reference altitude value from the
reading of a GPS system.