>You're right, of course.  I have some additional info.
> The frequency range will be from low to about 1KHz,
>may be more.  The pressures will be extremely low.  I
>don't know how to quantify it, but I don't think it
>would be a problem with whatever that is available.
>Again, I'm looking for something that's off-the-shelf
>(boss won't let me build one.)  [sigh]

Probably best if you quantify the application.

>Wallace Yang
>Associate Technical Analyst
>Heart and Stroke/Richard Lewar Center of Excellence
>U of T

Heart and Stroke? - medical application ?

If so then assuming use on live patients, you probably really need a 
commercial unit to avoid potential legal problems. 

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