Home / Products / Cleanroom & Facility Monitoring / Gas Particle Counting Gas Particle Counting For particle measurements in compressed gas in accordance with ISO 8573 standards comes arguably the best range of ported and vented high-pressure diffuser on the market. Lighthouse ActiveCount 100 Gas Sampling Adapter Lighthouse High Pressure Gas Diffusers Lighthouse HPC 1100 High Pressure Controller Lighthouse Solair 1100LD Particle Counter (0.1um) Lighthouse Solair 3100 Particle Counter (28 lpm) Lighthouse Solair 5100 Particle Counter (28 lpm)