You may want to check your states guidelines for hearing screening. The
is an otoacoustic emissions screener, and is generally not the first line device for general hearing screenings. In Texas, the only accepted method is pure tone screening with an audiometer.
Otoacoustic emissions screeners do not measure hearing sensitivity, it is just a measure of the outer hair cell function in the cochlea.
Otoacoustic emissions screeners and tympanometry can be used in conjunction with pure tone screening in some states, but is generally reserved for the very young (under 3) or those that are unable to screen with pure tone audiometry.
My district has the same Ero-scan, but we only use it on students who we suspect may be truly hearing impaired (ie-who failed pure tone and have no visible ear issues that failure can be attributed to-no wax, fluid, infection, etc). And for me too, it is very difficult to get a seal good enough to get a reading-especially on the younger kids.