I picked up the 2.25" altimeter that I might use. I have not yet taken it up to see if it works right, or brought it to a repair station. I need to do this. It is military surplus NSN 6610 00 781 4197. Aerosonic P/N: A80-AAU-16/A
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http://www.rv8.ch/article.php/20060413104001948
