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Since 1994, FINE permeation tubes act in market of spare parts for gas and air quality analyzer. In particular FINE manufacture permeation devices especially utilized as the source of trace gas in air pollution analyzer calibration and for test on gas sensor systems. Tubes filled with Sulphur Dioxide, Nitrogen Dioxide, Ammonia, H2O, Hydrogen Sulfide, Mercaptans and other hundreds of different compounds are available. Permeation tubes are employed in gas test equipment calibration in alternative at cylinder-supplied calibration gas standards.