Now, prior to a motion can start analyzing for the METAS acceptance, it first needs to pass the chronometer tests under the Contrôle Officiel Suisse des Chronomètres (COSC). So the METAS test isn’t an alternate to the COSC chronometer certificate, but instead an extra one.

The 8 METAS standard tests: Average daily precision of the eye Function of the COSC-approved motion during exposure to 15,000 Gauss magnetic field Function of the watch during exposure to stated 15,000 magnetic field Deviation of Everyday precision after exposure to 15,000 magnetic field Water resistance Electricity book Deviation of rate between 100 percent and 33% of power book Deviation of rate in six Distinct positions For the Calibre 8900, the tests included a simulation of actions while wearing the watch, to be able to demonstrate immunity to magnetic and water fields. The watch went magnetic field to calculate its precision that was chronometric after 24 hours. These tests had to be done in six different positions and under two alternating temperature zones. So in case you’ve got a Master Chronometer watch, rest assured it is exceedingly precise and has field resistance of 15,000 Gauss, water-resistance of 150 metres, and a power reserve of 60 hours.