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MQ-7 CO Carbon Monoxide Coal Gas Sensor ModuleFeatures-The analog output voltage, the higher the concentration the higher the voltage.The carbon monox..

MQ-9 Carbon Monoxide, Methane, and LPG Gas Sensor ModuleFeatures-Good sensitivity to CO/Combustible GasHigh sensitivity to Methane, Propane, and COLon..

SeeedStudio Grove Gas Sensor(MQ9)Features-High sensitivity to Combustible gas in a wide rangeStable performance, long life, low costFast responseWide ..