Perk Up Your Ears
As you lose your hearing, your ability to hear very high tones is the first to go. Here's how you can test this. Turn on a television set and turn the volume all the way down or put it on mute. Lean over the back of the set and listen for a soft, high pitched whine. If you can hear it, you are listening to sound that is in the highest range of human hearing. Walk away from it to determine you distance threshold.
Hearing Test
This is from

Perk Up Your Ears: Discover Your Sense of Hearing.

Illustrated by Cynthia C. Lewis.
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