Specifications include, but are not limited to: . MUST operate on 10Amp @ 115VAC 60Hz. . Volumetric flow control using ambient temperature and pressure compensated mass flow sensor. . Operate at a flow rate between 5 to 18 liter/minute. . MUST HAVE USB Ports for Data downloads . Operating temperature range of -25 C to 50C. . MUST not weigh more than 85 pounds. . Filter temperature MUST BE maintained within 5C of the outdoor ambient temperature. . Flow audit adapter kit. . Microprocessor with menu driven software, display and keypad. . Sensors for Ambient temperature and pressure and for filter temperature. . MUST BE able to store interval data of 5 minute averages for ambient/filter temperature, ambient pressure, and sample flow. .Sampler MUST use a standard 47mm filter housed in reusable cassette. . Sampler MUST maintain a constant volumetric flow rate of 16.7L/min flow. . Filter data storage MUST include temperature, pressure, flow, volume, filter ID. . MUST BE able to store up to 32 filter data records.