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One of the pillars of this new Zenith vision was the El Primero 21 (a watch we looked at in some detail here), which took the iconic high-frequency chronograph that is the El Primero and rocketed it to the next level.
You see, the regular EP runs 5Hz, allowing 1/10th of a second accuracy. The chronograph on the El Primero 21 runs at a boggling 50Hz, meaning that the chrono hand makes a single revolution in a second, and offers 1/100th of a second accuracy. Of course this rate only applies to the chronograph operation; timekeeping runs at a more sedate and less power-hungry 5Hz, which is plenty accurate for day-to-day timekeeping.
https://timeandtidewatches.com/hands-de ... 21-carbon/
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