The Okdo TelePort analog alcohol sensor MQ-3 sensor can detect the alcohol, like a alcohol detector. Its gas-sensing material is SnO2 with lower conductivity in clean air. When alcohol gas is detected, the sensor’s conductivity will increase as the gas concentration rises and output values will also get larger. In addition, it features quick response. Compatible with RJ11 6P6C OKdo TelePort Control boards and expansion shields
Can be used to detect alcohol in breath
Operating voltage of 5VDC with adjustable sensitivity using the onboard potentiometer