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Two Sonar Recorders are available for anyone who is interested in experimenting with putting together a low cost side scan sonar system. 1)Raytheon Precision Electrographic Recorder and 2)Gifft Precision Sonar Recorder use 19” paper and both come with detailed service manuals. These units are working properly and are in very good condition. I can provide several rolls of paper for each recorder. Each unit is for sale at $75 or trade for something that I can use. You will have to come to the Rochester, NY area to pick up the recorder. Email me for pictures of each unit and the specifications.