... : 2000 international quality system certification. (2)Colorimetric gas detector tube can detect the concentration of various gases rapidly without any Energy ... power supply. (3)It features in simple operation and portability. (4)It can detect different toxic gases in the air including CO,CO2 ... , HCN,HCL,HF,NO,NO2over 600 types of target gas can be measured. For product Details, please contact us at any ...