... , including underground Coal Mine, petrochemical, metallurgical, chemical, municipal gas, and other places at the scene detection; Technical specification Technical ... 0.01%volDisplayLiquid crystal display(LCD)displayResponse time≤20s(T90)Alarm sound intensity≥75dBAlarm light≥20M visibleAlarm pointcan be set in ... the product you want according to your requirement. Portable gas detecting alarm for co2 ...