The BGI PQ200 is the only battery operated EPA reference method for ambient PM2.5 sampling. It is also a reference method sampler for PM10. The PQ200 has a microprocessor controller, mass flow controller, programmability and download/storage capacity. The PQ200 is weather proof and can operate off of a battery up to 24 hours. TSP or PM10 can be measured with the correct inlet adaptors (available upon request). The BGI PQ200 is our most portable USEPA PM2.5 reference sampler.