Guides for Chronospace from Breitling

Part of the instruction manual for the Breitling Chronospace in English:
The certification test for wristwatch chronographs with quartz oscillators consists in observing each movement for 11 days and 11 nights, in several positions and at 3 different temperatures (8ºC, 23ºC, 38ºC). To earn the prestigious chronometer label, a movement’s performances must meet 7 very strict criteria, including a daily variation in rate of within ±0.07 seconds, corresponding to an annual precision of ±25 seconds. The variation in rate of the SUPERQUARTZ™ caliber fitted in your BREITLING watch far and above exceeds these demands, achieving a rate of ±15 seconds a year....
Breitling Chronospace
Manufacturer: Breitling
Model: Chronospace
Size of the instruction manual: 5.38 MB
Category: Miscellaneous

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