MQ-2: Combustible gas, smoke sensor, high sensitivity to liquefied gas, propane, hydrogen.
MQ-3: Alcohol sensor, high sensitivity to alcohol.
MQ-4: Methane and natural gas sensor, with high sensitivity to methane, and good sensitivity to propane and butane.
MQ-5: Combustible gas sensor with high sensitivity to butane, propane and methane.
MQ-6: Propane sensor, high sensitivity to butane, propane and methane.
MQ-7: Carbon monoxide CO gas sensor, the sensitivity of carbon monoxide
MQ-8: Hydrogen sensor with high sensitivity to hydrogen.
MQ-9: Liquefied petroleum gas sensor, with high sensitivity to carbon monoxide, methane and liquefied petroleum gas.
MQ-135: Air quality sensor, high sensitivity to ammonia, sulfide, benzene vapor.