Three different types of ear probe tips (soft plastic, hard plastic, and foam) used in impedance audiometry were investigated with respect to similarity of measurements between ear tips and reliability of measurements obtained with the same ear tip.
Results suggest that comparable measurements of acoustic, impedance, compliance, auditory reflex thresholds, and middle ear pressure can be obtained with any of the three types of ear probe tips used. Soft and hard plastic ear tips tended to produce more reliable measurements of impedance and compliance on a test-retest basis than did the foam type. All three types of tips provided highly reliable measurements of acoustic reflex thresholds at 500, 1,000, and 2,000 Hz.
Richards GB, Kartye JP. Comparison of Three Types of Ear Tips Used for Impedance Audiometry. Arch Otolaryngol. 1973;97(6):437–440. doi:10.1001/archotol.1973.00780010451001
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