28 May '17, 1am

Inside Rolex’s secret testing facility https://t.co/1VcPcS9jS3

Inside Rolex’s secret testing facility https://t.co/1VcPcS9jS3

The Metas certification involves eight tests, three of which concern magnetism, while the rest deal with chronometric precision, power reserve and, of course, water resistance. These are not straightforward hurdles to clear. Take, for instance, test number three: “deviation of daily chronometric precision after exposure to 15,000 gauss”. The unmagnetised watch is subjected to a field of 15,000 gauss and then allowed to run for 24 hours in a magnetised state, during which its precision is calculated. The following day it is demagnetised and the chronometric precision tests are run again – the aim being to show that the difference between the magnetised and demagnetised performance is negligible. At first, 20 per cent of the watches submitted to these eight tests were deemed in need of further adjustment before being resubmitted, but by the beginning of this year that propor...

Full article: https://howtospendit.ft.com/watches-jewellery/200849-the-...

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