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Elecfreaks Octopus MG811 CO2 Gas Sensor Octopus MG811 CO2 Gas Sensor is a CO2 electronic brick in our OCTOPUS series, the basic design for the outlook, PCB fixing holes and connections are the same wi Product #: businesspro-Elecfreaks Octopus MG811 CO2 Gas Sensor 2023-08-18 Regular price: $HKD$500.0 Available from: Businesspro MallIn stock