Chronometer watches from Beaverbrooks. A chronometer is a watch that has been tested and certified by an independent body to ensure the highest of precision. This official neutral body is the Official Swiss Chronometer Testing Institute (COSC), and only the COSC can deem a Swiss watch worthy of ‘chronometer’ status – hence the term ‘chronometer-certified’. While quartz watches can be certified as chronometers, chronometer watches usually have mechanical movements that are accurate to within -4/+6 seconds a day. Featuring Breitling, Omega and Bremont, all of these impressive watches have passed rigorous testing to ensure you get unrivalled quality, accuracy and precision.