Shock resistant watch
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Shock resistant is a common mark stamped on the back of wrist watches to indicate how well a watch copes with shocks.
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[edit] ISO 1413 shock-resistant standard
The International Organization for Standardization issued a standard for shock resistant watches, which many countries have adopted. ISO 1413 Horology -- Shock-resistant watches specifies the minimum requirements and describes the corresponding method of test. It is intended to allow homologation tests rather than the individual control of all watches of a production of a production batch. It is based on the simulation of the shock received by a watch on falling accidentally from a height of 1 m on to a horizontal hardwood surface.
In practice shock resistance is generally tested by applying two shocks (one on the 9 o'clock side, and one to the crystal and perpendicular to the face). The shock is usually delivered by a hard plastic hammer mounted as a pendulum, so as to deliver a measured amount of energy, specifically, a 3 kg hammer with an impact velocity of 4.43 m/sec. The watch must keep its accuracy to +/- 60 seconds/day as measured before the test.
[edit] Usage
Since their appearance shock resistant watches have found a wide application in different activities, especially where people deal with shocks to their wrists.
Today even divers' watches (according to ISO 6425) must correspond not only with such criteria as water resistance, luminosity, magnetic resistance and strap solidity, but also shock resistance.
