M811B Digital Clock | Flight Time Recorder, Elapsed Time MeterThe M811B Digital Clock is a multi functional chronometer designed to operate under the most stringent operating conditions. It features three independent 6 digit solid state timing circuits: time, flight time, and elapsed time which can be controlled by the pilot. The incandescent display is readable in sunlight. Version 811B 1 has the ability to adjust local time to 12 hour or 24 hour setting. NOTE: 28V install requires the 811 28 Dropping Resistor