... MQ2 MQ-2 LPG I-butane Propane Methane Alcohol Hydrogen Smoke Gas Sensor Module Long Size: 32mm x width 22mm ... liquefied petroleum gas, butane, propane, methane, alcohol, hydrogen gas, smoke and other monitoring means.Applicable occasion: SCM learning, electronic competition ... , product development, graduation design New MQ-2 smoke gas sensor module liquefied natural gas modules ...