![]() The time base is supplied by a dedicated internal power reserve to provide the timekeeping function even when the aircraft power is removed. It supports the simultaneous indication of a combination of clock- and timer-function reading and has several day/night mode backlight options including NVIS A and B compatibility. It features a three line display with light digits on dark background (negative image). The measuring range of this instrument is engraved on the upper edge of the case. ![]() The CM20 is designed according the latest civil and military avionics standards. Switzerland, around 1970, altitude measurement up to 6000 m above Change of the air pressure, for hikers and mountain climbers, plastic-Aluminium housing. The Thommen Classic altimeter plus barometers are the finest instruments on the world market. DIGITAL CHRONOMETER GENERAL The THOMMEN CM20 is a Swiss Made precision, multifunctional chronometer designed to operate under the most stringent operating conditions in civil and military aircraft.
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