The highest precision of the Windows Clock is measured in nanoseconds (1 billionth of a second). It is capable of providing an accuracy and resolution of up to one nanosecond, which is equivalent to 0.000000001 of a second. This is the closest precision that can be achieved on Windows operating systems. To achieve this accuracy, the system must be configured to receive time from an external source, such as a Network Time Protocol (NTP) server. Additionally, the system must be equipped with a highly precise hardware timer, such as a quartz or atomic clock, which typically have accuracies of up to 10 milliseconds (0.01 seconds).