Jaeger-leCoultre MASTER CONTROL CHRONOGRAPH CALENDAR Manual page 13

Chronograph Calendar watch's internal flange is
equipped with a pulsometric scale which allows
you to measure the frequency of heartbeats
per minute.
Use:
- Reset the seconds hand by pressing the push-
piece at 4 o'clock to be ready to perform the
measurement.
- Press once on the push-piece at 2 o'clock to
measure 30 heartbeats. The seconds hand
turns (the minute counter is also in operation
but is not used for pulsometer measurement).
- After 30 heartbeats, press the push-piece at 2
o'clock again to stop the chronograph.
- Read the frequency of heartbeats per minute
indicated by the seconds hand on the
pulsometric scale on the flange.
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