The MQ3 Alcohol Gas Sensor consist of a low cost semiconductor, whose conductivity is low in clean
air. Its quality of becoming more conductive when come in contact with alcoholic gases makes it
useful in detection of alcohol consumption. The sensitive material used for this sensor is SnO2, and it
is sensitive to alcoholic gases. As the concentration of alcohol gases increases, the conductivity of
the sensor increases and it can be used to detect the presence of alcohol gases at concentrations
from 0.05 mg/L to 10 mg/L.