Application description:
  For the first time on iPhone!
An effective hearing test that measures your threshold of hearing for sounds of different frequencies.
Find out just how far your ears can hear ranging frequencies.
Most of the people should be able to hear up to around 15kHz. From around 17kHz upwards, we get into a range that only the under 20's can hear.
General:
The human auditory system is sensitive to a wide range of sounds, both in terms of frequency (pitch) and intensity (loudness).The lowest sound (in pitch) we can typically hear is about 20 Hz, and the highest sound 20KHz. However, we are not all equally sensitive with all differing frequencies.
Features:
• With this version, you will test your frequency threshold, using static volume tones.
• Using the iPhone headphones, you will be asked to adjust the iPhone volume, for clear and effective playback tones. 
• Your left and right ear will be tested alternately with every frequency, from the above frequency ranges.
• After the test has been completed, you will get a report of your hearing frequency response.