Profile: Fine Permeation Tubes manufacture permeation devices, which is used as the source of trace gas in air pollution analyzers calibration and for test on gas sensor systems. We provide permeation tubes, which is a small container filled with a pure chemical compound in a two-phase equilibrium between its gas phase and liquid phase. Our permeation tubes are ideal devices in generation of calibration gas standard for air quality analyzers, gas analyzers and gas chromatograph.