... ammonia detecting tube 1.NH3 detecting tube 2.low cost & high accuracy 3.custom-made. 1.We are one of the leading gas detecting tube ... 2.Our company specializes in producing colorimetric gas detection tube. All kinds of tubes have been granted ... Monoxide, Carbon Dioxide, Oxygen, Wind direction(Smoking generating tube), Ammonia, Hydrogen Sulfide, Nitrogen Dioxide, Sulfur Dioxide, Chlorine, Benzene ...