The RTP Profiler uses a Plantower light-scattering sensor to provide real-time data for two size ranges approximating PM10 and PM2.5. It is a low-cost sensor that is intended to show trends during the sample run, supplementing the filter data. The ARA N-FRM Sampler logs 5-minute averages during the filter sample collection. Data is stored and easily extracted via USB Flash Drive. The conversion factors from count to mass can be updated by the user for improved accuracy.