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From: Bret Schichtel
Date: 10/28/2002
Time: 4:56:07 PM
Remote Name: 129.82.108.243
Air Resource Specialist operates the Optec nephelometers for the IMPROVE program and you can probably get this information from them: http://www.air-resource.com/index.html
Also, the Optec website has a lot of information on the NGN-2 at: http://www.optecinc.com/visibility/ngn2.html as well as contact information