Extech Instruments TM20 User Manual page 6

Temperature Alarms
Set high/low alarm limits as described below. The meter will then audibly and visually alert the
user if either limit is exceeded:
1. Press the ALARM/SET button once from the normal operating mode; the upper limit value
and its symbol (up arrow) will flash.
2. Set the temperature limit by pressing the ▲ button (press and hold for fast scrolling).
3. Now use the MAX/MIN button to activate/deactivate the alarm (alarm symbol will appear
in the upper right hand corner of the LCD when activated).
4. Verify the setting by pressing ALARM/SET.
5. Perform the same steps for the low alarm limit.
After setting the alarms, the upper and lower limit symbols (▲▼) will be displayed on the LCD
indicating that an upper and a lower alert value has been set. If the measured temperature
exceeds either limit, the alarm beeper will sound for 1 minute. The alarm beeper icon and the
corresponding arrow will flash. Pressing any button will switch off the alarm.
When the temperature returns to the desired range the audible alarm will stop sounding. The
arrow will remain flashing however to show that the temperature was higher or lower than a set
value at least once in the past. Press the ▲ button to switch OFF the flashing arrow.
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