The following list shows TAG Heuer average tolerance given by the Swiss movement suppliers (based on normal conditions, and full power reserve for automatics): The accuracy of TAG Heuer watches depends on several factors, including the type of movement and conditions of use. Why does my automatic watch not keep accurate time? While it is less precise than a quartz movement (by a few minutes per month), an automatic movement is the ultimate example of Swiss watchmaking expertise and tradition. All of these mechanical components work continually in unison, creating the effect of a sweeping second hand rather than a ticking one. An automatic movement comprises over 70 parts (up to 480 parts for the Mikrograph) and the smallest of these is no thicker than a human hair (0.07mm).
The regulator of the watch is a balance wheel with a hairspring that vibrates 6 – 8 times a second (up to 10 times in the Calibre 36 and 100 times in the Mikrograph). An oscillating weight (rotor) pivots freely around a spindle, and each movement helps to wind the mainspring (energy source), charging the power reserve.
An automatic movement is a mechanical watch movement that is wound by the action of the wearer’s wrist.
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