title: Direct reading gas detecting tube systems.
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D003124:Colorimetry / Q000592:standards*; D005740:Gases / Q000032:analysis*; D006801:Humans; D008722:Methods; D009787:Occupational Medicine / Q000592:standards*; D011786:Quality Control
chemical_list: D005740:Gases