Origina, working WWII German Aircraft RARE Höhenmesser – ALTIMETER Fl. 22320. Used in Focke-Wulf FW 190, Messerschmitt Bf 109, Arado Ar 96, Heinkel He 111, Junkers Ju 88, Gotha Go 242 and others. Hohenmesser Fl. 22320 instrument measured the altitude of the aircraft using the surrounding air pressure. Located on the main instrument panel of many early and late war German aircraft.