MQ3 Ethanol Sensor

Tuned to alcohol vapour, this is the sensor behind hobby breathalyser projects and fermentation monitoring. It gives an analogue output that rises with ethanol concentration plus a digital output at an adjustable threshold. It reads relative concentration rather than blood alcohol content, and it also responds to other organic vapours. Treat any breathalyser you build with it as an educational demonstration only, never as a basis for deciding whether someone should drive. Specifically tuned to ethanol and alcohol vapour; Analogue output plus adjustable digital threshold; Popular for breathalyser and fermentation projects; Fast response and recovery