FIELD: measurement technology. SUBSTANCE: local or average speed is measured in the point of diametral section of the flow at a distance from axis of the tube accounting with error in its section area. Local speed is measured in arbitrary point of specified working diametral section of the flow, which has axis to be in coincidence with axis of the tube. Measurements are carried out according to the relation, given in the description of the invention. EFFECT: improved precision of measurement.
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