A tympanometer gives hearing care professionals the ability to assess the function of the middle ear. GSI tympanometers include fully clinical and diagnostic instruments, screening devices with limited testing capabilities, handheld or portable options, and combination devices that have more than one modality. The type of tympanometer used in each facility depends on the patient population and specific testing needs. A clinical middle ear analyzer will be the most versatile and includes predefined test types such as tympanometry with multiple probe tones, Y, B, and G immittance options, reflex threshold testing, reflex decay, ARLT, Multi Hz, and ETF tests (intact, patent, patulous). Diagnostic tympanometers allow for basic tympanometry, ipsilateral acoustic reflex testing, and sometimes have the option to upgrade to specific special tests such as contralateral reflex testing or additional probe tones. Screening and handheld tympanometers are limited to basic testing capabilities.