The movement has been tested for magnetic resistance. Now the finished watch is tested as a complete instrument.
This simulates four days of real wear. Temperature and position change throughout the day, just as they do on the wrist. The watch is tested in both a magnetised and a demagnetised state.
Magnetic fields are everywhere. Phones, laptops, bag clasps, induction hobs. This test exposes the watch to 15,000 gauss, a level far beyond anything encountered in daily life, and then measures whether it still keeps time.
From a full wind to the very last tick. This test measures the watch’s precision across its entire power reserve, in every position.
The final check. The time displayed on the dial is compared with the acoustic measurement of the movement itself. The two must match.
The purpose of this final METAS test is to prove that the watch complies with its stated water resistance.
Before the watch leaves the Laboratoire, it is physically inspected. The Laboratoire performs all measurements. METAS, the Swiss Federal Institute of Metrology, reviews the results and grants Master Chronometer certification.