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Because what’s more, is that these movements are tested after casing. There are probably some more brands that use stricter standards than COSC, but let’s stick to these. Grand Seiko uses an average daily rate of -3 and +5 seconds, Rolex promises -2 and + 2 seconds and Omega uses only positive rates from 0 to +5 seconds. So, why bother with an Observatoire Chronométrique+ certification? Isn’t a chronometer rated Lebois & Co Venturist not enough? Well, you probably have noticed that brands like Rolex, Omega and Grand Seiko for example, started to embrace some stricter standards.

the position of the watch (3 o’clock, 6 o’clock, 9 o’clock, dial on top, dial on the bottom)Ī complete summary of the testing procedure can be found on the official COSC website here.

Watch movements are tested for 15 days in the laboratory of COSC, on two different variables, namely: To this very day, this is the framework that the COSC uses to certify wrist watches.

This standard was defined (“Lays down the definition of the term “chronometer”, describing the categories, the test programme and the acceptable minimum requirements for wrist-chronometers.”) in 1976 and revised again in 2009.

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The current chronometer certification is based on the ISO 3159 standard. That’s right, it is a protected name to use on a dial. The movements with certification can have the word ‘chronometer’ on the dial. Those who didn’t pass the test need to be adjusted again, those who did pass the test will be cased. After a while, they will receive the movements back. These tests are defined by the COSC and watch brands have little to say about these, they just need to send the movements with a ‘test’ dial and ‘test’ crown.

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In order to have a chronometer watch, or chronometer certified watch to be precise, its movement – or watch – must have been sent to the official Swiss Chronometer Testing Institute for some series of tests. For a mechanical watch, that’s pretty neat to have. To be more specific, it has an average daily rate between -4 seconds and +6 seconds. With a chronometer (not chronograph) certified watch, you can trust your watch is very accurate. To understand what this is, we have to recap the regular chronometer certification. It has been tested by Timelab and received an Observatoire Chronométrique+ certification. Besides a handsome watch (I will come to that later), this watch has more to it. Lebois & Co is proud to introduce to you their new watch, the Venturist. The world has changed since 1973, when the Contrôle Officiel Suisse des Chronomètres, the Official Swiss Chronometer Testing Institute, was founded.

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The Professional Subscription is for Health professionals looking to track client data and can also be a good option for Families wishing to have multiple Gold accounts, or for monitoring family member's diets.For some watch brands, the chronometer certification is just not good enough anymore. You can subscribe to gold here: Professional Account Extended Library charts (GKI, Glucose, etc.).The Gold subscription is for individuals looking for improved functionality of Cronometer.

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Access to the iOS and Android Mobile Apps.Sync selected activity trackers and apps to import data to your diary.Access to the Cronometer Community Database.Nutrition data from lab analyzed sources.Cronometer is pleased to offer ALL users access to: You can continue to use the free version of Cronometer for an unlimited amount of time.

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