High-pressure turbine flowmeters measure flow by converting fluid momentum into rotor rotation. The meter body contains an axial turbine rotor supported by bearings. When fluid enters the measuring chamber, guide vanes straighten the flow before it strikes the rotor blades. The flowing fluid drives the rotor, and its rotational speed is proportional to the average flow velocity within the measuring section. A magnetic pickup mounted outside the pressure boundary detects each blade passage. As the rotor turns, the blades modulate a magnetic field, producing electrical pulses. The pulse frequency is directly proportional to volumetric flow rate, while the total number of pulses represents accumulated volume. Each meter has a calibrated K-factor, usually expressed as pulses per liter or pulses per gallon. The signal processor converts pulse frequency into instantaneous flow and totalized volume. High-pressure construction is essential for safe operation. The housing, flanges, seals, and internal components are designed to withstand high static pressure and pressure surges. Robust bearings and wear-resistant materials maintain rotor stability and measurement accuracy. Because performance depends on fluid viscosity, density, temperature, and installation conditions, proper filtration, straight piping, and regular calibration are important. With pulse output and reliable high-pressure sealing, these meters are widely used for hydraulic systems, oil and gas, chemical processes, and high-pressure test benches.