Places a bluff body in the flow path to shed vortices via the von Kármán effect, counting the shed rate to calculate fluid velocity and volume.

A differential-pressure instrument that measures how fast a liquid, gas, or steam moves through a pipe by constricting flow through a primary element.

A velocity-based device that measures volumetric flow rate — fluid moving through the pipe spins an internal bladed rotor.

Directly measures the true mass of a fluid or gas moving through a pipe per unit of time.