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.
The peak acceleration delivered to the watch head is 3100g +/- 15%, in sinusoidal form, over 350 microseconds.
In both cases a trap door is used to drop the watch onto a surface calibrated to deliver the same shock profile as in the impact tests above.