Methane gas detector with LCD display EVIKON E2638-R-LEL-LCD | Bola Systems
Gas Detector, Natural Gas/LPG/Coal Gas Leak Aalrm, 3-Pin Plug-in Sensor Gas Monitor with Sound Alarm and LED Digital Display, Methane Propane Butane Combustible Gas Alarm for Kitchen Garage Hospital : Amazon.co.uk: DIY
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MQ-4 Gas Methane (CNG) Detector Sensor Module
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Combustible Gas Detector Methane natural Gas Leak Analyzer Tester Alarm Portable | eBay
IR12EM Amphenol Sgx Sensortech, Gas Detection Sensor, Methane / Hydrocarbon, 0-5% or 0-100% Volume | Farnell UK