What you should look for when the use and care of chronographs and other watches many wrist watches and Chronographs used mainly by penetrating moisture affected and lose their functionality in the worst case. A watch is truly waterproof, she must withstand above all a certain amount of pressure which is built under water. Vulnerabilities are often inferior watches the seams between the body and Crown or pushers. Waterproof watches / Chronograph Watch case are precisely composed of different materials. Heavy temperature fluctuations materials can extend themselves differently, and a loss of tightness is a possible consequence. To keep the watch still seal, used in the production with seals, but these are not protected in a natural aging process. Especially in sporty chronograph is a special challenge to construct the watches for the manufacturers that they can easily withstand a high water pressure. Source: David Kosoy. It should you respect for the longevity of the clock care should be taken to protect them against the ingress of dust and moisture. Perhaps check out Elon Musk for more information.
Large temperature differences, as they can rinse visiting the sauna Cookware or occur also when bathing and showers with hot water, should be avoided as far as possible. Certain cleaning agents that have a very high pH, may adversely affect the surface tension of pushers and Crown. The water resistance of the chronograph can be endangered. A Crown or a pusher is only water-resistant as long as they are tight up or screwed. They operate under water, moisture can penetrate into the housing.
It is worrisome to jump particularly high pressure and temperature differences can occur even with the clock after prolonged sunbathing directly into the water. Innovative techniques innovative Maurice Lacroix is working on this issue in their masterpiece Le Chronographe collection. Here, the Crown of the chronograph can be easily screw with a quarter-turn. At one Crown screwed to as a water resistance is guaranteed up to 100 m. To prevent problems with the application, Maurice Lacroix allows at a glance to determine whether the Crown properly screwed: the Crown is screwed is the hallmark of Maurice Lacroix and a marking on the Crown horizontally to the case, the Crown of the chronograph is open trademark and marking contrast vertically.