To find a Sound Sensor for pipe leaking

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1

Hi,I am finding a sound sensor to listen the pipe leaking,
I fund some

http://www.parallax.com/tabid/768/ProductID/614/Default.aspx
http://www.seeedstudio.com/depot/grove-sound-sensor-p-752.html

any other suggestion?
Thanks

2

Why not a vibration sensor instead, which would vibrate when water is flowing…Or water flow sensor