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A tympanogram is graph produced by tympanometry. It shows the movement of the tympanic membrane and is most often cone-shaped. The peak of a tympanogram is where the eardrum is balanced between negative and positive pressure. Also, tympanometry measures the middle ear. The Eustachian tube is to equalize the pressure in the middle ear with the atmospheric pressure. For example, when you are on a plane and the pressure in the cabin changes, you may notice a “popping sound”. This is the sound of your Eustachian tube opening to equalize the pressure in the middle ear. Some individuals experience Eustachian tube dysfunction which can create positive or negative pressure in the middle ear and is measured and read on the tympanogram.