3ATM anti watch

Since the first "oyster style" watch was launched by ROLEX Rolex in 1926, the oyster style seat cushion designed specifically for the underwater gate can effectively remove moisture and dust. From then on, wrist time officially entered. In addition, the timing circle should be used before the sub head on the top right side of the inverted triangle or at the beginning of the aperture until the end of the diving landing, and the diver can determine the time by sliding the track. Diving time. Water activities are more than enough, and to do scuba diving, the water depth must be at least 200 meters (20ATM) to ensure safety. Perhaps you will be questioned, even for diving, it is rare to go 30 meters into the sea. So, why can underwater be called a 200 meter diving watch? Is it really necessary? According to Zhu Pijie, a Dunwen Sports Watch specialty store, from a physical perspective, every 10 meters increase in depth increases the pressure inside the barometric case. When the pressure is uneven, the case is prone to bursting. Therefore, most watch manufacturers test the waterproof function of watches based on the "pressure value", and use the pressure value (in BAR or ATM) to represent the water depth. The environmental pressure that lung diving sports bodies are subjected to is dynamic. In order to ensure that the pressure reduction action does not cause the risk of the watch case bursting at the moment of pressure, it is necessary to increase the pressure resistance of the watch itself, Devices designed to prevent "helium gas" invasion are usually located in the deep sea due to different odds of competition,