Calibrated in 5 mL subdivisions, these graduated, borosilicate glass midget impingers are used to collect samples of pollutants in air.

• Orifice at the bottom of the bubbler tube is 1 mm
• Passes 0.09–0.11 CFM of air at a vacuum of 12" H₂O
• Adaptable to any air sample running steadily at 0.1 CFM
• All Standard Taper joints are 24/40

Midget Graduated Impingers are 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).