need help to find a low flow rate sensor with at least 10Hz samping rate

Hi,
Thanks for the reply from all of you. Really helpful.
Sorry for the short discreption. For this project, we are mimicking the blood flowing in a tube, so the velocity is low, we use a pump to push the blood mimicking fluid flow into a tube(4mm). So the flow rate is as low as our blood.
Blood flow rate through each carotid artery = 350 ml/min (Kandel et al., Principles of Neural Science, New York: McGraw Hill, 2000)
Blood flow rate through basilar artery = 100-200 ml/min (Kandel et al., 2000)
For the velocity, should between ?1/6)m/s to (1/2)m/s.
I will measure the fluid property during its steady state, so I pump it from 1 pot to another pot.
Thanks.

Tony