The waterproof od watches relie on the watch mirror, the back cover and the waterproof rubber ring at the first place to meet the corresponding standards. All waterproof watches are with "WATERRESISTANT" or "WATER PROOF" in english on the caseback. No mark ones can only dustproof, should avoid water. 30 meters (3ATM, or 3 atmospheres) waterproof watch, which can be used for daily cleaning or rain, that is, water droplets are splashed on the surface without any water pressure on the watch.
General watch waterproof specifications are divided into the following: 30 meters, 50 meters, 100 meters, 300 meters, 500 meters.
30 meters: refers to the general life of water, that is, when washing hands splash of water droplets, as well as raindrops falling raindrops, but can not pay attention to too long,
Don't wear watches in the sauna.
50 meters: and 30 meters no difference, can be ignored.
100 meters: you can take him to the car, shower, but not soaked in water.
300 meters: for swimming activities, but only for shallow swimming. (never understand that it can be 300 meters.)
500 meters at this level can be submerged, if I'm not mistaken, it is like 1, 200 or so, may be more, but not according to the established value to do so, maybe that is the limit of your watch can bear, so don't use this method for performance test table.
1, bite mouth waterproof structure. The difference between the utility model and the thread bite type is that the bottom of the table has threads, and the main shell frame and the bottom shell have concave and convex notches to bite each other. The selection of structure only in the Tissot brand watches.
2 、 thread tightening waterproof structure. This is the most common and the most important kind of waterproof watches. This kind of structure is used in domestic watches. It is characterized by a back cover and a case with a threaded connection, pressure and a sealing washer, 0 after the edge of the cover 8, 10, 14 other symmetrical corners, the meter can be used to open up. The Soviet Union's "flying", "Russia" and other brands, although the bottom without thread, another thread closed after the ring should also belong to this category.
3 、 water withdrawal and waterproof structure. The bottom shell is a concave steel bowl, the watch machine is installed in the steel bowl, the pressure tight ring and the table cover are covered, and the main shell frame is closely connected with the watchcase, and the waterproof performance is good. It is not the case of thread, rounded edges, the edge of the lid and a sealing washer, by squeezing together, use the blade open. Only dry string (commonly known as the rod) for the double bar, the junction is easy to store water rust. Imported Swiss watches are often made of this kind.
4 、 waterproof structure of knife uncovering back cover. This waterproof watch is often overlooked and mistaken for a general list. It is the same with the sword, and ordinary table cover, but well, handle table, cover the same rubber pad ring, also can have waterproof function. A great reputation of "Armani watches have used this waterproof structure.