Water Resistant mark

ISO 6425ISO 2281water resistancewater resistantWater resistant watchwaterproof rating water resistant mark200-metre depth (20atm)ISO 6425 divers' watches standardWATER RESIST
Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water.wikipedia
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Diving watch

dive watchdiving watchesdiver's watch
The test for qualifying a diving watch for repeated usage in a given depth includes safety margins to take factors into account like aging of the seals, the properties of water and seawater, rapidly changing water pressure and temperature, as well as dynamic mechanical stresses encountered by a watch.
A true contemporary diver's watch is in accordance with the ISO 6425 standard, which defines test standards and features for watches suitable for diving with underwater breathing apparatus in depths of 100 m or more.

Watch

wristwatchwatcheswristwatches
Water Resistant is a common mark stamped on the back of wrist watches to indicate how well a watch is sealed against the ingress of water.
None of the tests defined by ISO 2281 for the Water Resistant mark are suitable to qualify a watch for scuba diving.

Antimagnetic watch

ISO 764magneticMagnetic resistance
Today, even divers' watches (according to ISO 6425) must be anti-magnetic as well as being water resistant, sufficiently luminous, shock resistant and have solid straps.

Shock-resistant watch

ISO 1413shockShock resistance
Even divers' watches (according to ISO 6425) must correspond not only with such criteria as water resistance, luminosity, magnetic resistance and strap solidity, but also shock resistance.

Pressure

water pressurenegative pressurefluid pressure
The test pressure can be indicated either directly in units of pressure such as bar, atmospheres, or (more commonly) as an equivalent water depth in metres (in the United States sometimes also in feet).

Bar (unit)

mbarbarmillibars
The test pressure can be indicated either directly in units of pressure such as bar, atmospheres, or (more commonly) as an equivalent water depth in metres (in the United States sometimes also in feet).

Atmosphere (unit)

atmatmospheresatmosphere
The test pressure can be indicated either directly in units of pressure such as bar, atmospheres, or (more commonly) as an equivalent water depth in metres (in the United States sometimes also in feet).

Metre

metermmetres
The test pressure can be indicated either directly in units of pressure such as bar, atmospheres, or (more commonly) as an equivalent water depth in metres (in the United States sometimes also in feet).

Foot (unit)

feetftfoot
The test pressure can be indicated either directly in units of pressure such as bar, atmospheres, or (more commonly) as an equivalent water depth in metres (in the United States sometimes also in feet).

Properties of water

waterH 2 Owater molecule
The test for qualifying a diving watch for repeated usage in a given depth includes safety margins to take factors into account like aging of the seals, the properties of water and seawater, rapidly changing water pressure and temperature, as well as dynamic mechanical stresses encountered by a watch.

Seawater

sea watersaltwatersalt water
The test for qualifying a diving watch for repeated usage in a given depth includes safety margins to take factors into account like aging of the seals, the properties of water and seawater, rapidly changing water pressure and temperature, as well as dynamic mechanical stresses encountered by a watch. The required 125% test pressure provides a safety margin against dynamic pressure increase events, water density variations (seawater is 2% to 5% denser than freshwater) and degradation of the seals.

International Organization for Standardization

ISOISO standardInternational Organisation for Standardisation
The International Organization for Standardization issued a standard for water-resistant watches which also prohibits the term waterproof to be used with watches, which many countries have adopted.

Fresh water

freshwaterfreshlimnic
The required 125% test pressure provides a safety margin against dynamic pressure increase events, water density variations (seawater is 2% to 5% denser than freshwater) and degradation of the seals.

Swimming (sport)

swimmerswimmingSwimming and Diving
When a diver makes a fast swimming movement of 10 m/s (32.8 ft/s) (the best competitive swimmers and finswimmers do not move their hands nor swim that fast ) physics dictates that the diver generates a dynamic pressure of 50 kPa or the equivalent of 5 metres of additional water depth.

Finswimming

fin swimmingfinswimmerfinswimmers
When a diver makes a fast swimming movement of 10 m/s (32.8 ft/s) (the best competitive swimmers and finswimmers do not move their hands nor swim that fast ) physics dictates that the diver generates a dynamic pressure of 50 kPa or the equivalent of 5 metres of additional water depth.

Diving chamber

hyperbaric chamberdecompression chamberrecompression chamber
Diving at a great depth and for a long period is done in a diving chamber, with the (saturation) diver spending time alternately in the water and in a pressurized environment, breathing a gas mixture.

Saturation diving

saturation diverssaturation divesaturation
Diving at a great depth and for a long period is done in a diving chamber, with the (saturation) diver spending time alternately in the water and in a pressurized environment, breathing a gas mixture.

G-Shock

CasioCasio G-ShockCasio G-Shock Mudman
The watches in the G-Shock line are designed primarily for sports, military and outdoors-oriented activities; nearly all G-shocks are digital or a combination of analog and digital and have a stopwatch feature, countdown timer, electroluminescent backlight and 200-metres of water resistance.