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Elitech Inframate C CO2 R744 Refrigeration Gas Detector – ElitechEU
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Smoke and Carbon Monoxide Detector Requirements for Landlords - The Good Estate Agent
Carbon Dioxide Monitor CO2 Detector Alarm - Mains Powered - MERLIN CO2 – CMD Online
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Carbon monoxide detector - Wikipedia
Protect your family and install carbon monoxide alarms
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Dangerous' carbon monoxide alarms removed from Amazon and eBay - BBC News