New methods for qualitative testing of the Eustachian tube function have been devised. A threshold pressure device has been constructed by which required threshold negative or overpressures can be produced within the rhinopharynx during deglutition without giving any troublesome blowing of air through the nose. The pressure range produced by the device ranges from —40 to +40 mm Hg. The tubal air passage is indicated with the aid of a flow rate meter device opening into ambient pressure. This is connected to a cuff system which is airtightly inflated with glycerine when lodged selectively within the bony part of the ear canal. During the tubal air passages small air puffs are developed in the external ear canal, which are recorded as an air flow. Thanks to the high sensitivity of the flow meter device the method can be used for cases with both intact and perforated ear drums. These methods are intended for clinical tubal function studies, and various tubal function tests have been carried out.