Datasheet : https://dlnmh9ip6v2uc.cloudfront.net/datasheets/Sensors/Biometric/MQ-8.pdf https://cdn.sparkfun.com/datasheets/Sensors/Biometric/MQ-8%20Ver1.3%20-%20Manual.pdf FEATURES * High sensitivity to Hydrogen (H2) * Small sensitivity to alcohol, LPG,cooking fumes * Stable and long life APPLICATION They are used in gas leakage detecting equipm ents in family and industry, are suitable for detecting of Hydrogen (H2), avoid the noise of alcohol and cooking fumes, LPG,CO.