Quick view xxx | sku: GS-11 MQ-137 ; Gas Sensor Ammonia NH3 Detector MQ-137.pdfParameters:MQ-2 smoke gas sensorMQ-3 alcohol sensorMQ-4 methane sensorMQ-5 LPG Natural Gas City Gas SensorMQ-6 isobutane propane sensorMQ-7 carbon monoxide sensor moduleMQ-8 hydrogen sensorMQ-9 carbon monoxide combustible gas sensorMQ-135 air... View Details Compare