Timekeeping instruments — Wrist-chronometers with spring balance oscillator
|Publication Date:||15 December 2009|
|ICS Code (Watches):||39.040.10|
This International Standard lays down the definition of the term "chronometer", describing the categories, the test programme and the acceptable minimum requirements for wrist-chronometers.
NOTE Wristwatches using a tuning fork oscillator are subjected to these tests pending the availability of separate standards.