[Divers and waterproof watches are different !?] Basic knowledge of watches that you do not know unexpectedly-Part 2 explains waterproof performance. | Watch LIFE NEWS ｜ Watch comprehensive news site to enjoy watch life
Once a month, we will change the theme and explain the basic knowledge of watches for beginners. The second theme will be a close-up of "waterproof performance"!
Divers' watches and waterproof watches have different uses !?
It is a diver's watch that is often seen as a popular genre of watch magazines, but many readers may not understand it well because they seem to know accurate information on waterproof performance. So this time, from a beginner's point of view, let's explain the definition and waterproof performance of a diver's watch that even beginners can understand. First of all, I would like to explain the difference between the "atmospheric pressure" display shown by ATM (atom) and BAR (bar) and the "m" display. In water, the water pressure increases by 1 atm for every 10 meters of depth. Therefore, many people think that 10ATM or 10BAR is almost the same as 100m water resistance, but in reality, the two are different. The waterproof display by "atmospheric pressure" only shows the atmospheric pressure that can be tolerated in a stationary state, not the waterproof resistance when moved underwater.
On the other hand, in the case of "m" display, 100m waterproofing has resistance up to 100m and waterproofness that can be used in water for a long time. In JIS (Japanese Industrial Standards), based on the difference between this "pressure" display and "m" display, it is assumed that a "waterproof watch" that is supposed to be used in daily life and that it is actually used for scuba diving, etc. It is safe to remember when choosing a watch that it is categorized into two types of "diver's watches".
This is a JIS (Japanese Industrial Standard) standard. In ISO (International Organization for Standardization), all are unified with "m" display, and in Japan, the waterproof watch to which the "barometric pressure" display is applied is "Water Resistant", and the diving watch is "Divers". ) ”Is written separately.
》 Check the standard of diver's watch (diving watch) By the way, according to one theory, the water pressure of the water coming out of the faucet is about 1.5 to 5 atm when the faucet of the house is twisted. If you put it out, the pressure will increase further. If you want to use it for daily use without worrying about water, you can use it for daily use at least for water sports (10 to 20 atm). If you are particular about safety, it is better to choose an air diving watch (water resistant to 100 to 200 m) that is categorized as a diver's watch.
》 Recommended model of the editorial department-Part 1 His BALL WATCH (Ball Watch) engineer Hydrocarbon Original engineer Anniversary model that appeared in 2019 to commemorate the 15th anniversary of the birth of hydrocarbon. In addition to being water resistant to 300 meters, the chronometer-certified high-precision movement features the ball's unique resistance to the ball, including a spring-lock seismic system that mitigates the effects of shocks by up to 66%, and an atomizer shock-absorbing ring that protects the movement. Equipped with impact technology. With regard to magnetic resistance, the mu-metal movement holder and inner case have achieved 80,000 A / m. ■ Ref.DM2118B-S1CJ-BK. SS (40 mm diameter). Water resistant to 300m. Automatic winding (Cal.RR1102C-SL). 308,000 yen This work is thoroughly tough. Usually, these spec-oriented watches often sacrifice practicality, but the case is 40 mm, which is actually the smallest size in the collection. There are many large models, and I would like you to check it out if you are an engineer who has avoided his hydrocarbon because of its size.
[Contact] Ball Watch Japan (TEL. 03-3221-7807) https://www.ballwatch.com/global/jp/home.html
》 Recommended model of the editorial department-Part 2 FAVRE-LEUBA Raider Harpoon 42 A new 42mm case added to Raider Harpoon, a full-scale diver's watch with 300m water resistance. The biggest feature is the design of a single hand with only a minute hand, which was devised to make it easier to read fractions. "Time" is read from the number of the houring that goes around the outer circumference of the dial in 12 hours. In other words, the time of the model in the photograph is 10:08 because the minute hand indicates 10 of the houring and the position of the 8th minute of the small minute scale inside it. ■ Ref. 00.131.08.52.20. SS (42 mm diameter). Water resistant to 300m. Automatic winding (Cal.FL301). 435,000 yen Although it overlaps with the content written on the left, the rug is short, so even if you are not a large person, it fits in the width of your wrist, so the balance of appearance is not bad.
[Contact] Swiss Prime Brands (TEL. 03-4360-8669) https://favre-leuba.com/jp
》 Recommended model of the editorial department-Part 3 Seiko Prospex Seiko Divers Watch 55th Anniversary Limited Collection 1965 Mechanical Divers Reprint Design Anniversary model commemorating the 55th anniversary of the birth of Seiko Prospex. Based on the historical model announced in 1965, which is a milestone of Seiko Divers history, the fabric-like rubber belt called "TROPIC" that was installed at the time of release is realized with reinforced silicon material, and the original design is realized. Reproduced as much as possible. The case is equipped with Everbrilliant Steel, and the movement is equipped with the mechanical high-beat caliber "8L55" exclusively for divers' watches, which realizes stable carrying accuracy by high-speed vibration of 36,000 times per hour (10 vibrations per second). It has achieved the aesthetics and durability suitable for a high-end model. ■ Ref.SBEX009. Everbrilliant steel (39.9 mm diameter). Waterproof for 200m air diving. Automatic winding (Cal.8L55). Limited quantity of 1100. 715,000 yen (scheduled to be released on Saturday, June 6)
[Contact] Seiko Watch Customer Service Office (TEL. 0120-061-012) https://www.seikowatches.com/jp-ja/products/prospex
Sentence ◎ Takuma Funahira (Editor)