I am in search of a small ultrasonic proximity sensor that does not 
cost and arm and a leg. 1/2" Dia or smaller.  Most of the ultrasonic 
sensors I have worked with are much larger than that. Willing to make 
an attempt to roll my own if a transducer that small is out there. 
Can anyone point me in a direction of a manufacturer/supplier ?

Regards,
Kevin Jones

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