30 psi is not high pressure.

You can use a absolute pressure gauge to measure the puff. It has to be
physically small to be able to follow the pressure wave. It's also
interesting to know where you mount it in such small tubing. I would be
tempted to use a piezo disk type of sensor mounted a fixed distance in
front of the opening, and calibrated with puffs of various pressures. Do
not use a real piezo disk, use some other piezo transducer (crystal
microphone).

The books seems to say that this is best measured using doppler ultrasound
in the tube, using several MHz frequency. Probably such equipment costs a
fortune.

Peter

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