For businesses who have clients at different parts of the world, especially business process outsourcers,  a digital atomic wall clock is highly recommended. This type of clock provides the highest accuracy and frequency standards known.
 
Atomic clocks make use of microwave signals instead of radioactivity. You can select a time zone you want and your clock will pick up a frequency that will give you the current time in that time zone at its most accurate. Hence, you are sure your businesses, be it a conference call or an online report, are always on time.