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Limitations of the MMS-10 tympanic displacement analyser.

Using the MMS-10 tympanic displacement analyser, the test-retest variation was determined in 20 normal hearing ears (ten subjects) for the measurement parameters Vi and Vm. Variations were found to be on average 60 nl for Vi and 72 nl for Vm. The consequences of these substantial test-retest variabilities for the applicability of the device and interpretation of the measurement results are discussed.