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The term "waterproof" was discontinued starting in the late 1960's. "Waterproof" was considered to have misrepresented the products as more capable of preventing the entry of water under normal use circumstances than they were actually capable of. Specifically, diving-type watches never have been completely 'proof' of water entry under normal use and within the stated depth ratings. The seals that keep water out are not completely impervious and their effectiveness can be reduced over time with age, deterioration, and exposure to chemicals.
The term "water resistant" is now used to describe such watches. There are no technical differences between a waterproof watch and a water resistant watch--they use the exact same methods and technologies to keep water out. The difference is only in what term was considered to appropriate to describe it at the time it was made.
The Water Resistant mark is a common mark stamped on the back of wrist watches. It is usually accompanied by a rating in terms of meters or feet of pressure which the device is supposedly able to resist.
The "Water Resistant" mark has come to replace the "Water Proof" and is now described by two ISO Standards: ISO 2281 "Horology - Water-resistant Watches" and ISO 6425 "Divers’ Watches"
Watches are usually marked with one of the following ratings:
30 Meters/100 Feet
50 Meters/160 Feet
100 Meters/300 Feet
1000 Meters/3300 Feet
These however, do not generally indicate the point at which a watch's resistance to pressure is expected to fail. For example, a watch rated 30 Meters would not be expected to survive Scuba Diving to 30 Meters, but would be expected to survive light splashing, for example wearing in the shower.
The reason is that the rating describes the static water pressure that the watch will survive. However, any motion of the watch underwater will increase the water pressure on it. Consequently, water at pressure coming from a tap directed onto a watch that is water resistant to 30 metres may leak into it, as will diving or swimming vigorously at any depth.
A watch rated 50 Meters is expected to survive immersion without pressure such as being worn while washing up dishes.
A watch marked with 100 Meters should be able to survive surface swimming.
A watch marked with 200 Meters should be able to survive Scuba Diving to a depth of 30 meters.
A watch marked with 1000 Meters should be able to withstand pressure greater than 500 Meters which is at the edge of the limit of human endurance.
Because of the historical disparity between what watch makers claim, and what watches are actually expected to be able to survive, the ISO Standard specifies a complex testing procedure for each mark. For example to receive the "Water Resistant 30M" mark, the watch must be able to survive 60 minutes under water at a depth of 10 cm (2.54 inches) followed by 10 minutes under a pressure of 3 ATM or approximately 73 PSI, with no water leakage into the case.
Now imagine diving into the ocean from 10 meters up with your favorite watch blink.gif what an impact that is....way beyond what most watches could withstand
Dont ever jump of a cliff with you watch on....never ever do it..not even from 1 or 2 meters up yeah.gif
Furthermore if you like your showers hot dont bring your watch...high temperatures (above 40C) may damage the water protection seals of a watch g.gif
