Iso 3159:1976 Timekeeping Instruments -- Wrist-chronometers With Spring Balance Oscillator

Manufacturer	Unbranded
Model Number	B000Y2SUYC

This document provides the definition of a chronometer, the types of wristwatch that can use a tuning fork oscillator, and the standards that must be met in order for these watches to be classified as chronometers.

Lays down the definition of the term "chronometer", describing the categoeries, the test programme and the acceptable minimum requirements for wrist-chronometers. Wristwatches using a tuning fork oscillator are subjected to these tests pending the availability of separate standards. This title may contain less than 24 pages of technical content.