On parts made of metal, silicone, plastic, sapphire (the watch crystal or the back of specific watches): Below you will find our tips, which can be followed alongside strict hygiene measures, such as washing your hands frequently. In the wake of the Covid-19 coronavirus pandemic, hygiene precautions need to be stepped up in everyday life. Quartz chronometers are up to 10 times more accurate than a standard quartz watch (± 0.07 seconds per day). Quartz chronometers are tested for 11 days in one position and at three different temperatures. For this, the movement must strictly be equipped with an electronic system to offset variations in precision caused by temperature changes. It is therefore possible for a chronograph to be a chronometer, but only if it has been awarded the certificate by the COSC.Ī quartz watch can also be certified as a chronometer by the COSC. To earn the title of chronometer, the mechanical movement's average precision must be between -4/+6 seconds per day. Chronometer movements undergo precision testing for 15 days and 15 nights in various positions and at different temperatures, as well as water resistance tests. A chronograph therefore has two independent measuring systems: one to indicate the time and another to measure short periods of time.Ī chronometer is a high-precision mechanical watch, which has been awarded an official certificate by the official Swiss chronometer inspectorate (COSC). Its uses include timing the duration of a sporting event using the chronograph hand, accompanied by minute and hour counters. The minute will take 30 minutes to reach the bezel's main indicator, thereby indicating remaining diving time.Ī chronograph is used to measure time which has elapsed from a given moment. For example, for a 30-minute dive starting at 15:00, align the bezel's main indicator with 15:30 (at six o'clock) just before diving. When the minute hand meets the main indicator, the diving time will have been reached. To use a unidirectional bezel for deep-sea diving, place the bezel's main indicator (initially positioned at 12 o'clock) at the projected time for the end of the dive. When measuring diving time, for example, any impact or false manoeuvre can only reduce the pre-set limits, preventing the user from having an exaggerated interpretation of air or decompression time. A unidirectional bezel only turns one way to prevent it accidentally turning in the wrong direction and therefore giving a false reading. A bidirectional bezel can rotate in both directions, clockwise and anticlockwise. Similarly, check that the crown is in position 1 (pushed in) or screwed down (depending on the model) before you enter the water.Ī bezel is an adjustable ring on the case, often used to record additional data, such as the duration of an event or to read the time in a second time zone. We also recommend that you do not under any circumstances open the watch yourself and do not adjust the time-setting crown and/or pushers (buttons) when your watch is underwater. As stipulated in our Watch care section we recommend that you have the water resistance of your watch checked once a year by an approved Tissot service agent. However, many water-based activities involve a lot of movement and other environmental changes which exceed the boundaries of the tests conducted and may therefore affect the water resistance of a watch.Ī watch's water resistance cannot be guaranteed indefinitely, as it may be affected by ageing gaskets or an accidental impact to the watch. Watches are pressure tested in a laboratory by means of tests conducted at various pressures corresponding to the pressure experienced by a swimmer or diver sitting still at various depths. Tissot watches are designed to be water resistant to a pressure of 3 bar (30m/100ft), 5 bar (50m/165ft), 10 bar (100m/330ft), 20 bar (200m/660ft) or 30 bar (300m/1000ft), as indicated on the case back.
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