Maurice Lacroix ISA 8161/204 Instrucciones página 12

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5. Tachometer scale :
A tachometer scale is printed on the dial ; it will measure the speed
in km per hour over a covered distance of 1'000 meters. Example :
1'000 meters covered in 45 seconds correspond to a speed of 80 km
per hour.
6. Battery change :
After changing the battery :
– Reset the time and the date (see chapters 1 and 2).
– Correct the chronograph (see chapter 3).
IMPORTANT :
Before resetting the time, make sure the chronograph is not opera‑
ting and the chronograph hands are at zero.
The watch is equipped with an auto stop and reset system.
For battery saving reasons, the stopwatch is automatically stopped
and reset to zero after 5.5 hours of operation.
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