Hi, I am looking for a directional flow sensor which has a response time on the order of milliseconds and comes in a small package (< 2 mm). It has to work in a high flow ambient, say 4 liters/sec, but does not have to quantitatively measure the flow, just sense directional changes. Does anyone know of any existing products. Thanks for your time. Sincerely, John Buan John S. Buan Minnesota Innovative Technologies and Instruments Corp. 603 Washington Ave. SE #503 Mpls., MN 55414-2950 buan0001@gold.tc.umn.edu phone: (612) 626-1541 fax: (612) 625-0558