Air Pollution Sampling Pump For use with the LaMotte Air Pollution Detection Outfits in monitoring atmospheric air pollution, checking eight-hour exposure limits for workers in industry, and more. Completely portable. Does not require any "down time" for recharging. Powered by four "D" cell batteries, the brushless DC motor pumps air to a small diaphragm valve assembly which maintains flow rates for 48 hours of continuous sampling before the batteries need replacing. Intermittent sampling extends the rang