•128 Hz - for assessing vibratory sensation, particularly useful in neurological peripheral vibration and other sensory deficits.
•256 Hz - is versatile, suitable for both assessing vibratory sensation and some hearing tests, though it is less commonly used than the other two frequencies for these purposes.
•512 Hz - used for hearing tests, such as the Rinne and Weber tests, due to its sensitivity to the frequency range of normal speech.