Calibrated in 5mL subdivisions. Used to collect samples of pollutants in air. Particularly suitable for determinations of sulfur dioxide by the West and Gaeke method and of oxidants, including ozone, by the alkaline potassium iodide method. For details of the methods see "Selected Methods for the Measurement of Air Pollutants," U.S. Public Health Service Publication No. 999-AP-1 1 (May 1965). The orifice at the bottom of the bubbler tube is 1mm. It passes 0.09-0.11 CFM of air at a vacuum of 12" H2O. Scientists rely on the expertise and artistic skills of Wilmad-LabGlass engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.