For use of MI 24 Impendance Tympanometer Screener, MI 24 touchTymp Tympanometer Screener, MI 26 Impedance Tympanometer with Audiometer, MI 26 touchTymp Tympanometer & Audiometer Screener w/ built in Printer, EasyTymp Handheld Screening Tympanometer, ERO-SCAN® Plus Portable Otoacoustic Emission (OAE) Hearing Screener and Ero-Scan Otoacoustic Emission (OAE) Hearing Screener Test System.