Profile: Quelle Corp provides occupational health & safety software, ear scan impedance audiometer which is a middle ear analyzer. We also offer spyrometeres, stereo optical vision testers, titmus vision screeners & good-lite vision cabinets and charts. We offer products like audiometric equipment, spirometer, vision tester, occupational health & safety software & 3D animation. The earscan3 series of audiometer are programmable, allowing customization of the entire test procedure, from intensity step size to the frequencies selected for testing. New cutting edge highly configurable spirometer. features; FVC, FVL and MVV testing. The graphic curve display allows quick assessment of results. Meets ATS recommendation for diagnostic spirometry