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4 Gas Monitor Multi Gas Detector for H2S, CO, LEL, O2. The Guard-122 is a versatile portable gas detector designed to monitor four hazardous gases simultaneously: carbon monoxide, hydrogen sulfide, explosive gases, and oxygen levels.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.