The THOMMEN CM20 is a Swiss Made
precision, multi-functional chronometer designed
to operate under the most stringent
operating conditions in civil and military aircraft.
The CM20 is designed according the
latest civil and military avionics standards.
It features a three line display with light digits
on dark background (negative image). 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.
The time base is supplied by a dedicated internal
power reserve to provide the timekeeping
function even when the aircraft power