An ultrasonic flow meter includes a flow tube, and first and second ultrasound transducers that transmit ultrasonic pulses through a liquid flowing through the tube. The flow tube includes a reflector assembly that reflects pulses from the first transducer to the second transducer, and from the second transducer to the first transducer, thereby facilitating different sequences of time-of-flight measurements. A microcontroller obtains multiple sequences of measurements, where all the measurements in a single sequence are of the same measurement type, and each sequence uses a different type of measurement than that used by the other sequences. The microcontroller filters out the longest and shortest time-of-flights and, using an average of the remaining time-of-flights, calculates a volumetric flow rate of the fluid.