Presumably two different instances of this clock would have different tick rates due to the specific crystal used and it's very difficult to produce two identical crystals.
An atomic clock is very consistent across devices as it exploits the properties of an element which is much more repeatable (just have to have a quantity of the element).
An atomic clock is very consistent across devices as it exploits the properties of an element which is much more repeatable (just have to have a quantity of the element).