JW Fishers DHI-1 Diver Held Interrogator

"The DH-1 gives precise distance and heading to target" Operating the DHI-1 is easy; select the transponder frequency to be located and scan the area with a 360 degree sweep. When the diver points the DHI-1 in the direction of the transponder, an audio alarm sounds through the underwater earphone and the LED light bar flashes. The DHI-1 displays the distance to the transponder and a  compass mounted on top of the DHI-1 provides the diver with the precise heading to the target.  The DHI-1 acoustic sonar interrogator calculates the distance to the transponder by measuring the time between the transmit signal and the return signal.  As the diver moves in the direction of the target the distance (in feet or meters) is constantly updated to give the precise distance. "The DHL-1 Boat Deploymnet Kit can significantly reduce diver search time" If several transponders are operating in the area, the diver can switch the DHI-1 frequency to match the next acoustic transponder and repeat the procedure to the next target. The DHI-1 can detect and give range and bearing on acoustic transponders at a distance in excess of 3,000 feet, and is compatible with most other manufactories transponders. The DHI-1 is powered by a nicad battery pack that will operate for 12 continuous hours before recharging is required.  A 120 volts ac charger is included.  An optional 220 volt transformer is available to charge from 220 - 240 volts ac.  Single underwater earphone is included.  Dual underwater earphones are optional. The optional underwater connector must be ordered with the receiver to use the Boat Deployment Kit. Fishers Diver Held Interrogator is ruggedly built for commercial operations and is covered by a full 2 year warranty.