CO2 detecting tube 1.detect oxygen 2.low cost 3.custom- ... are exported to South Africa, Brazil and some European countries. Carbon Monoxide, Carbon Dioxide, Oxygen, Wind direction(Smoking generating tube), Ammonia, Hydrogen Sulfide ... Dioxide, Sulfur Dioxide, Chlorine, Benzene, Toluene, Xylene, Hydrogen, Ethylene, Phosphine etc. They can meet requirement of different customers.4.Tube Type: CO,CO2 ...