Comark KM340 - Manual (Page 10)

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4.4 HOLD Mode
Pressing the HOLD key to enter the Data
Hold mode, the “D-H” annunciator is
displayed. When HOLD mode is selected, the
thermometer holds the present reading and
stops all further measurements.
Pressing the HOLD key again cancels HOLD
mode, causing the thermometer to resume
taking measurements.
4.5 MAX Mode
Press the MAX key to enter the MAX mode.
The thermometer then records and updates
the maximum value for that input. The MAX
annunciator appears on the display. Press
the MAX key again to exit the MAX recording
mode.
In the MAX mode, press HOLD key to stop
the recording, press HOLD again to resume
recording.
The maximum function is limited to use on
a single temperature scale at a time and
for readings which do not make a transition
through zero.
5. OPERATOR MAINTENANCE
5.1 Battery Replacement
Power is supplied by a 9 volt, PP3 battery.
The battery sign appears on the LCD display
when a replacement is needed. To replace the
battery, remove the three screws from the back
of the instrument and lift off the front case.
Exchange the battery in the protection tube
located at the top of the rear cover. Replace
the instrument front squarely with the rear
cover and secure with the three screws.