GASTEC Detector Tubes indicate concentrations directly by way of a calibrated scale printed on the tubes. GASTEC endeavors to achieve the highest quality detector tubes and products for analyzing airborne gases and vapors, as well as pollutants in soil and water through their advanced state-of-the-art research and development. Through their efforts they have acquired a solid reputation among customers in virtually all sectors of industry, commerce and society. Tubes are now available for more than 500 different applications.