The GSI 39 provides a flexible, screening product for tympanometry, acoustic reflex measurements, and audiometry to meet testing needs today and in the future. The GSI 39 is available in five different versions: select the features needed today, and upgrade easily to additional features as needs grow in the future. Version 1 through 5 of the GSI 39 offers the option of 1 kHz testing capability for tympanometry, whereas version 1 through 4 provides tympanometry/reflexes. The addition of the 1 kHz allows tympanometry and tympanometry/reflex testing on babies less than 6 months of age. This is helpful when isolating the likely cause of a "refer" from a new-born hearing screening program. The GSI 39 is lightweight, portable, and designed to make detection and documentation of middle ear pathologies fast and accurate. The GSI 39 also is Electronic Medical Record (EMR) compatible.