Best Gas Detector For Refinery

First Alert GCO1 (1039758) Plug-in Combination Explosive Gas and Carbon Monoxide Alarm with Battery Backup

Techamor Y401 Natural Gas Detector, Home Gas Alarm and Monitor, Propane Gas Detector and Gas Leak Alarm for LNG, LPG, Methane, Coal Gas Detection in Kitchen, Home, Camper (1)

TopTes PT520A Natural Gas Detector, Gas Leak Detector with 43.5cm Gooseneck, Locates Sources of Methane, Propane and Combustible Gas Leaks for Home and RV (Includes Battery x3) - Orange

TopTes PT199 Gas Leak Detector, Natural Gas Detector with Audible & Visual Alarm, Portable Gas Sniffer to Locate Combustible Gas Leak Sources Like Methane, Propane for Home(Includes Battery x2)-Orange

Plug in Carbon Monoxide Detector & Natural Gas Combination Detectors 4in1 CO Gas Temp Humidity Monitor with 2.1'' HD Screen & Indicator CO, Propane, Methane Explosive Gas Alarm

Neoteck Gas Leak Detector Natural Gas Detector with Audible & Visual Alarm, Portable Gas Sniffer to Locate Combustible Gas Leak Sources Like Methane, Propane for Home-Orange

Gas Leak Detector, Portable Combustible Gas Detector, Gas Sniffer for Flammable Natural Gas Acetone Propane Benzene Ethanol Gasoline Methane LPG in RV or Home, 9999 PPM 20% LEL with LCD Color Display

LSENLTY Carbon Monoxide Detector Plug in Wall, Carbon Monoxide Detectors with 2.1'' HD Screen&Indicator Visual&Audible Alarm, 3-in-1 CO Detector(CO Gas Meter, Temp and Humidity) for Home RV Travel

Gedsffati 4in1 Portable Carbon Monoxide Detector & Gas Alarm Combination Detectors CO Gas Temp Humidity Monitor, Natural Gas Detector Propane, Methane

Gas Alarm Detector Natural Gas Detector LPG Gas Leak Sensor Plug-in Gas Detector with Sound Warning and (Gas, Temp & Humidity) for House Kitchen Restaurant School Hotel Warehouse etc