Part of the shock test is a 1m drop onto a wooden floor simulator.
ISO 1413 shock-resistant standard[edit]
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 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/s (This will deliver approximately 30 Joules of energy to the watch). The watch must keep its accuracy to +/- 60 seconds/day as measured before the test.
https://en.wikipedia.org/wiki/Shock-resistant_watchClick to expand...