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1. Press
MODE
for more than one second to turn the back-
light on/off.
MEASUREMENT PROCEDURES
Data Hold
1. Press
HOLD
to freeze readings. The “HOLD” icon will
appear in the left-top corner of the LCD. All current
readings are frozen, except STEL and TWA.
2. Press
HOLD
again to cancel the “HOLD” function and
resume measurement.
Backlight
Minimum, Maximum, Short-Term Exposure Limit and
Time Weighted Average
1. While in Normal mode, press
MN/MX/AV
to view min-
imum, maximum, and weighted average readings.
2. Press
MN/MX/AV
to display MIN, MAX, STEL, and TWA
readings in sequence and then return to Normal mode.
3. In MIN and MAX modes, the unit displays minimum and
maximum CO
2
readings on the upper LCD and the AIR
and D
por
WB temperatures and humidity on the lower
LCD.