Clamp-on, non-invasive
Coriolis
Custody transfer
Differential pressure (DP)
Doppler ultrasonic
Magnetic/electromagnetic
Mass
Open channel, flume, weir
Orifice plate, flow nozzle
Pelton wheel
Pitot tube
Positive displacement
Solids
Target
Thermal dispersion/calorific
Turbine
Variable area
Venturi tube
V-notch
Vortex
Wedge