ISO 3159 - Chronometer

ISO 3159 standard defines the features of the chronometer - strap with balance wheel oscillator.

To be allowed to receive a formal and legal chronometer certificate, the watch requires to cover the complete accuracy criteria of this standard.

Watches are tested during 16 consecutive days according a specific protocol tray.

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The ISO 3159 chronometer standard is applied on Timepieces. 

Each watch is daily measured with a dedicated camera of vision.

In between 2 measures, the watch is manually wind it up and then placed in a climatic chamber (cold or warm).

To complete the protocol, a last wearing simulation is performed within 2 additional days.

To briefly summarized, 17 consecutive days of testing are required to perform the complete chronometer protocol.