Large Chamber - Colormetric tubes (Ammonia, Carbon Monoxide, Chlorine, Hydrogen, Hydrogen Sulfide, Sulfur Dioxide & Methanol), Formaldehyde (EPA TO-11A), Butyl Cellosolve (NIOSH 1403), Methane & Non-methane Organics (EPA 25C), Mercury (NIOSH 6009), VOC + TICs (EPA TO-15)