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Obtain four "AAA" batteries. To install them:
1. Open the battery compartment by using your thumb to
slide its cover down and away from the meter.
2. Install the batteries in series in the compartment,
observing the polarity markings inside.
3. Close the battery compartment by sliding the cover back
up on its track until it snaps shut.
OPERATING INSTRUCTIONS
To power on the HHAQ-108, briefly press the PWR button.
The CD will illuminate and immediately begin scrolling "Os"
across the five positions on the upper readout to indicate that
it is warming up. During the warmup period, the meter will
burn off any dust on the formaldehyde sensor inside the
vented ball. If this is the first use of the meter or if it has not
been powered on for a long time, the warmup period may last
as long as several hours.
Normally, it takes 1 to 15 minutes for the scrolling to stop.
Once it stops, the upper readout will begin counting down
from 9999 through 8888 and 7777 all the way to 0000. When
the upper readout reaches 0000, if no formaldehyde is
present the upper readout will begin reading 0.00 ppm, the
lower readout will begin alternating displays of ambient
temperature and RH, and the term HCHO (the chemical
formula for formaldehyde) will appear below the lower
readout.
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