REDUCED SCUBA PRO PDS-2 "PERSONAL DIVE SONAR 2" NEW, MEASURES DISTANCE The SCUBA PRO Personal Dive Sonar 2 (PDS-2) is a compact hand held electronic instrument designed to provide a diver a means to determine underwater distance and depth to the bottom. The PDS-2 transmits high frequency pulses through the transducer which radiate in a cone pattern from the front of the unit. $40. OBO