Jaeger-leCoultre MASTER CONTROL CHRONOGRAPH CALENDAR Manual page 12

To safely reset the chronograph, timing must
be stopped first using the push-piece at 2
o'clock.
TIMING
- The chronograph is activated by pressing
the push-piece at 2 o'clock once. The central
seconds hand will turn, and the minute counter
will run. Pressing the push-piece at 2 o'clock
again will stop the chronograph, enabling the
time measurement to be read.
- Reset by pressing the push-piece at 4
o'clock to be ready to perform another time
measurement.
- It is possible to add up several timing
operations by pressing on the push-piece at
2 o'clock again (without having to reset the
counter). Timing starts again and is added to
the previous measurement.
PULSOMETER
The pulsometer is an instrument for measuring
heartbeat frequency. The Master Control
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