General IRTC40 Mode D'emploi page 15

terms SCAN and HIGH to disappear from
the top line. Note that the temperature of
your hand will continue to be held and
displayed for up to 1 minute.
7. Repeat Steps 1 through 5, but instead of
targeting your hand, target a surface
colder than the wall (the inside of a
refrigerator, the outlet register of an
operating air conditioner in the summer,
or an exterior wall in the winter). Note
that as the laser pointer hits the colder
surface: 1) the color of the LCD backlight
changes from green to blue; 2) the term
LOW appears on the top line; and 3) the
beeper begins to sound repeatedly and
slowly (at 1 beep/sec). Together, these
visual and audible alarms indicate
that the targeted surface is at least
1°F (0.5°C) colder than the wall.
8. While continuing to target the cold
surface, release the trigger. This will
cause the beeper to sound three times
and the terms SCAN and LOW to
disappear from the top line. Note that
the temperature of the cold surface will
continue to be held and displayed for
up to 1 minute.
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