A microcomputer based method and its interface for the measurement of fluid flow using an 8253 (Programmable Interval Counter) counter is presented. The measurement system consists of a turbine flow meter and a microprocessor based linearizer unit. The turbine flow meter is interfaced with an IBM PC Compatible and gives linearised pulse output corresponding to a flow rate. The microcomputer is programmed to read and control flow rate which may be varied by a stepper motor driven needle valve. The software for the flow measurement has been developed and the same has been tested in real-time for feedback control system applications.