Description BX171 is a disposable portable single gas detector that can detect H2S, CO and O2 with small size and firm configuration. It is mainly intended for individual used to detect a confined space or the working environment where dangerous gases existed and harm to personal safety. It is normally clipped on belt, lapel or breast pocket. It can be widely used in the oil and gas industries, steelworks, chemical plant, mining,marine, power plants, sewage treatment plant, environmental protection, city construction, labs etc. Key Features ATEX approved Low power consumption Two alarm level STEL alarm, TWA alarm Visual, audible, vibrating alarm Confidence beep Low battery alert