Sonar Ruler

Sonar Ruler is a winner in the Best App Ever Awards - "Most innovative use of iPhone hardware" category!
The Amazing New Sonar Ruler is an experimental app that uses echoes to measure distances with your iPhone!
* It uses the same principles that dolphins use to find food! *
It sends a short pulse from the speaker and measures how long that pulse takes to bounce off of something and return to the phone. It then estimates how far away you are.
>> Impress your friends with what this unique app can accomplish using only an iphone! <<
Ϟ GIZMODO.com:
"that's a damned neat trick for a phone to be able to do."
Features:
* Sonic distance measurement up to 60 feet
* Set Units to feet, inches, or meters
* Custom saved settings for measuring in different environments
If you're a teacher, this app is a great way to teach students the principles of sonar, and how sound propagates through air.
** Watch a demo video here: http://bit.ly/sonarvideo
** German/Japanese subtitles here: http://bit.ly/sonarvid
Enjoy!
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*This is an experimental app, although it can be quite accurate, any measurements taken should be verified before using them.
Note: Use with iPads requires some adjustment to the chirp boundaries