They are suitable for alcohol checker, Breathalyser.
Structure and configuration of MQ-3 gas sensor is composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of sensitive components.
High sensitivity to alcohol and small sensitivity to Benzene.
Fast response and High sensitivity
Stable and long life
Simple drive circuit.