Shock Resistant - the only term acceptable in the U.S. to describe the ability of a timepiece to resist breakage. The standard test for shock-resistance is the ability of a watch to withstand a drop of 40 inches on to a hardwood surface with a gain or loss of no more than 60 seconds per day.

Incabloc - unlike standard screw-held balance staff jewels, this device uses springhead jewels, which produces shock resistance.

Anti-magnetic - term applied to clocks or watches that will not be affected by external magnetic forces, such as household appliance, etc. With the increasing popularity of magnetic and electronic devices, buyers and sales associates should be made aware that such devices could affect the performance of a watch, especially quartz watches.

Water-resistance - besides water-resistance, a water resistant watch also provides long-time protection of the internal parts from dust and dirt.