Tympanometry tests the condition of the middle ear, the mobility of the eardrum and the conduction of the middle ear bones, by creating variations of air pressure in the ear canal. When tympanometry is used with very young infants their small, soft ear canals may affect the test and give inaccurate results. Therefore, Midwest Hearing Aid Systems utilizes specialized equipment generating a high frequency probe tone to increase the reliability and accuracy of tympanometry for children 0-6 months of age.