Whether you are performing hearing screening in an educational or industrial setting, testing related to the fitting or evaluation of amplification, audiological research, or comprehensive diagnostic assessment, E-A-RTONE® 3A Insert Earphones provide many advantages that can enhance test reliability and minimize or eliminate problems frequently encountered with supra-aural headphones. Because the subject’s external canal is sealed with an E-A-RLINK® foam plug, which functions as a sound delivery