Mesa is proud to now offer filters for your environmental and personal sampling needs! Choose from PM2.5 Federal Reference Method 2.0 micron pore size Teflon PTFE 47mm filters or 47mm high-purity Quartz microfiber filters. Teflon PTFE filters include a hydro-inert support ring which lowers moisture fluctuations during sampling and analysis. Or choose our 37mm high-purity Quartz filters for personal sampling needs. Mesa’s environmental sampler filters have been engineered by metrologists to meet even the most stringent gravimetric analyses with high accuracy.