Sper Scientific 850027 Mini Environmental Quality Meter - Manual (Page 20)

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c. Clear the recorded MAX or
MIN value from the display
by pressing HOLD once. The
MAX/MIN symbols and their
readings, will disappear from
the display. The meter will
return to the REC function
and continue recording.
d. To exit REC function press
REC button for >2 seconds.
Auto power off disable
In order to prolong the battery
life, this instrument has an Auto
Power Off function: the meter
will turn off if no buttons are
pressed for approximately
10 minutes.
To disable the Auto Power Off
function, press REC and enter
the record function (page 19).
The Auto power off function
will be disabled until the record
function is exited.