> Are there any available clocks with that precision? Yes! The term you need to type into Google is "High Accuracy Quartz". The most easily available wristwatc

> Are there any available clocks with that precision? Yes! The term you need to type into Google is "High Accuracy Quartz". The most easily available wristwatches with this level of accuracy are the Bulova Precisionist line. Watchuseek has a subforum about HAQ: https://www.watchuseek.com/forums/high-accuracy-quartz-watches.9/ https://www.watchuseek.com/forums/high-accuracy-quartz-watch...