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JTM-SSJ III Combustible Gas Detector (Detects Single Gas / Dual Gases: Methane + Carbon Monoxide) Gas Alarm for Methane + Carbon Monoxide Leak Detection, Find Details and Price about Gas Alarm Household Gas Alarm from JTM-SSJ III Combustible Gas Detector (Detects Single Gas / Dual Gases: Methane + Carbon Monoxide) Gas Alarm for Methane + Carbon Monoxide Leak Detection - Jinan Ben'an Technology Development Co., LTD