[sudo-discuss] ultrasonic transducers

[Jake]

we have a bag of ultrasonic transducers, as seen here:

http://www.directindustry.com/prod/international-transducer/ultrasonic-transducers-25344-579552.html

in case you needed to do any ultrasonic transducing.  there are also 
electret microphones in the same bag, i think they were used together for 
physical location tracking, like short distance high-accuracy distance 
measurement.

-jake