Hadex MS6531B Instruction Manual page 11

To show the difference between the minimum and maximum values: press
"MODE" until "dIF" appears on the bottom left corner of the display.
To show the average recorded value: press "MODE" until "AVG" appears
on the bottom left corner of the display.
To set the high alarm level: press "MODE" until "HAL" appears on the
bottom left corner of the display. Press the up and down buttons to set
the alarm level.
To set the low alarm level: press "MODE" until "LAL" appears on the
bottom left corner of the display. Press the up and down buttons to set
the alarm level.
When the high and low alarms are set, the meter will beep if the
temperature measured is above the high level or below the low level. In
addition, the main display will show "Hi" or "Lo" and the icon in the top
right corner will turn red or blue to indicate high or low alarm respectively.
To turn on/off the laser pointers: during measurement, press the down
button to switch between the laser pointers on or off.
To turn on/off the backlight: during measurement, press the up button to
turn on or off the backlight.
To switch between °C and °F: while in HOLD mode, press the down arrow
to switch temperature units.
To lock the thermometer into measurement: While in HOLD mode, press
the up button and the thermometer will begin measuring and continue to
measure until the up button is pressed again.
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