Speedtech Instruments depthsounder Several years old in excellent condition. great for prawning and crabbing. Anchoring security for cruising sailors! Find deep water easily from your tender. It is very accurate and since it floats, its high visibility case makes it easy to find if dropped overboard. In addition to recreational use by boaters, scuba divers and ice fishermen, it is commonly used by coastal surveyors, bridge maintenance workers and scientists. Features Accurate 2-260 Ft. Reads in feet or meters to nearest tenth Waterproof and floats Reads thru air-free black ice, inflatable bottom or solid hull (sonar will not read thru air) Backlit digital display shows reading for 10-secs at a time or continuously.