GOYOJO Combined Gas Meter Carbon Monoxide Checker Japanese Audio Broadcast Carbon Monoxide Alarm Flammable Gas Hydrogen Sulfide Oxygen Loud Sound

---------------------------------------------------------------------- 1. [4-in-1 gas detection] Highly accurate and sensitive gas detector for carbon monoxide CO (0-1000 PPM), flammable EX (0-100% LEL), hydrogen sulfide H2S (0-100 PPM), oxygen O2 (0-30% VOL). 2. [Equipped with a high-sensitivity sensor manufactured by DDS, a major British company] Equipped with a high-performance gas electrolysis sensor for commercial use, with excellent response, reaction speed, accuracy, and reproducibility. It is almost unaffected by the usage environment such as temperature and humidity. 3. [Response