ETA caliber 251.264 AA
251.264 AA description
ETA PreciDrive movement.
Counters 12 hours chronograph at 10 o’clock, 30 minutes chronograph at 2 o’clock, 60 seconds chronograph with central hand, 1/100th of a second chronograph with central hand.
PreciDrive can achieve a precision which can pass the COSC chronometer certification, provided the watch is not exposed to impacts, and kept at a temperature of between 20°c and 30°c. This precision can be achieved thanks to the thermo-compensation operating principle, which controls and regulates the motor pulses according to changes in the ambient temperature. By virtue of combining the quartz and integrated circuit in the same waterproof case, the precision is insensitive to moisture.