Portrait
 
 The aims of the COSC are to:
 
• Measure and test the precision of watch and clocks movements in order to grant them official chronometer status.

• Promote the chronometer and undertake any legal action aimed at defending and protecting this title internationally.

• The COSC does not manufacture chronometers; it merely certifies that the watchmakers have provided this high value added for their products and attests that they may justifiably claim this prestigious title.

The BOs (short for "Bureaux Officiels de Contrôle de la marche des montres" - meaning Official Watch Rating Centres) currently constitute the three laboratories within the COSC.
Located in Bienne, Geneva and Le Locle, their mission is to test the movements submitted by manufacturers.

They have each earned individual accreditation as
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SCS (Swiss Calibration Service) laboratories from SAS (Swiss Accreditation Service).

The three BOs work with state-of-the-art equipment developed in-house by the COSC engineers. The specific requirements are such that all the BO instruments have had to be custom-made, since nothing equivalent exists on the instrument market.

The COSC management, based in La Chaux-de-Fonds, coordinates the operation of the BOs and provides them with the measurement and result management equipment, as well as ensuring maintenance.

It establishes the testing prescriptions applicable to the various types of movement submitted, it develops the equipment and measurement methods for the BOs and undertakes any necessary action in matters relating to marketing, communication and defence of the chronometer in the broadest sense of the term.