Which of the following meters is used to measure the velocity of fluid flow?

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Velocity is the speed of the fluid at a point, so you need a device that reports that speed directly. A velocity meter does exactly that, giving the instantaneous flow velocity. The other options measure different quantities: a mass flow meter reports how much mass passes per unit time, a turbine meter counts turbine rotations to infer volumetric flow rate, and an optic meter measures optical properties rather than flow speed. In practical terms, when you need the actual speed of the fluid, the velocity meter is the appropriate choice because it provides the direct measurement of velocity.