High Pressure Diffuser to assist in the testing of compressed air/gas systems for total air particulates. This diffuser can be used in conjunction with almost any Laser Particle Counter (LPC) on the market with a 1CFM, or 28.3, 50, 75, or 100 LPM Flow Rates for testing of particles down to 0.3microns. With the three piece construction of electro polished 316SS, the unit itself generates virtually no particulate matter.