Quote Originally Posted by Conumdrum View Post
OP: If your doing tests for reviews, your best bet is a flow meter like Skinnee or Martin uses. Lab grade tube style. If for normal PC use to monitor flow rates, then it's not worth the hassle or time.
Also to the OP...

The flow meter that they use is a king instruments. They make good stuff. Sidewinder has one (http://www.sidewindercomputers.com/kiin75seac.html), but you can get them for a lot cheaper from a place that sells instrumentation. Look around. Good pressure transducers and flow meters are available.

In a past life I ordered a lot of instrumentation for high and low speed wind tunnel and water tunnel experiments, if I remember the name of some of the catalogs I'll post them. Make sure to pay close attention to the range - it defines your resolution in most cases. You could also build a very precise manometer and flowmeter/velocimeter - an accurate calibration becomes the trick there though (especially for the flowmeter/velocimeter).