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yellow
crystals which turn green in the presence of alcohol, when the
rate of alcohol is
located
in the vicinity of 0.02% BAC. The change in the green color takes
place gradually
departing
from one end to the other, as little as the change of the temperature
on a
thermometer.
The more green crystals present, the higher the alcohol rate.
The person
tested
must blow a certain volume of air in order to inflate the plastic
bag the device comes
with.
The single use breathalyzer is then attached to the bag and the
air collected in the
latter
is then pressed through the tube which contains the crystals.
If the crystals change
color
from yellow to green, then the rate of alcohol is located at
0.02% or more. If the color
change
reached one of the red lines drawn on the tube, then the rate
of alcohol is located at
either
0.05% or 0.08% depending at what level the coloration reached.
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