The Digibar Pro is the most cost-effective means of obtaining accurate water column sound velocities. Used primarily to calibrate acoustic systems, the Digibar Pro offers a fast and safe method for sound velocity calibration as compared to the traditional ābar-checkā. Regardless of sea state or current, the probe is simply lowered into the water to log sound velocity / depth samples (by time or depth interval) as the probe descends. The āsing-aroundā principle of velocity measurement automatically compensates for all influences including pressure, water salinity and temperature.