Sound Velocity Sensor utilizes advanced digital signal processing techniques to take the time of flight & method of sound speed measurement to new heights. The sensor is able to resolve sound measurements to 0.01 m/s with an accuracy of ±0.05m/s (±0.03m/s rms) over the working range of temperature and pressure. sound velocity probes are designed to measure the sound velocity profile in the water column. These probes are needed to measure and correct for velocity changes.