Water Resistant mark

water resistancewater resistantWater resistant watchwaterproof rating200-metre depth (20atm)ISO 22810:2010WATER RESISTWater-resistant watchWater-resistant watchesWR mark
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 watchdiver's watchdiving watches
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

wristwatchwatchesdigital watch
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

magneticMagnetic resistanceMagnetic resistant watches
No magnetic or shock resistance properties are required.
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

shockShock resistanceshock resistant
No magnetic or shock resistance properties are required.
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

saltwatersea watersalt 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. Regarding pressure ISO 6425 defines: 1 bar = 10 5 Pa = 10 5 N/m 2 .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. Resistance to salty water. The watches under test shall be put in a 30 g/l NaCl (sodium chloride) solution and kept there for 24 hours at 18 to 25 °C. This test water solution has salinity comparable to normal seawater. After this test, the case and accessories shall be examined for any possible changes. Moving parts, particularly the rotating bezel, shall be checked for correct functioning.

International Organization for Standardization

ISOInternational Organization for Standardization (ISO)ISO standard
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.

Celsius

°CCdegrees Celsius
Condensation test. The watch shall be placed on a heated plate at a temperature between 40 °C and 45 °C until the watch has reached the temperature of the heated plate (in practice, a heating time of 10 minutes to 20 minutes, depending on the type of watch, will be sufficient). A drop of water, at a temperature between 18 °C and 25 °C shall be placed on the glass of the watch. After about 1 minute, the glass shall be wiped with a dry rag. Any watch which has condensation on the interior surface of the glass shall be eliminated.

Fresh water

freshwaterfreshlimnic
Regarding pressure ISO 6425 defines: 1 bar = 10 5 Pa = 10 5 N/m 2 .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

finswimmerfin swimmingfinswimmers
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.

Sodium chloride

NaClsaltroad salt
Resistance to salty water. The watches under test shall be put in a 30 g/l NaCl (sodium chloride) solution and kept there for 24 hours at 18 to 25 °C. This test water solution has salinity comparable to normal seawater. After this test, the case and accessories shall be examined for any possible changes. Moving parts, particularly the rotating bezel, shall be checked for correct functioning.

Salinity

salinesalinitiespsu
Resistance to salty water. The watches under test shall be put in a 30 g/l NaCl (sodium chloride) solution and kept there for 24 hours at 18 to 25 °C. This test water solution has salinity comparable to normal seawater. After this test, the case and accessories shall be examined for any possible changes. Moving parts, particularly the rotating bezel, shall be checked for correct functioning.

Newton (unit)

kNnewtonN
Resistance of attachments to an external force (strap/band solidity). This is tested by applying a force of 200 N (45 lb f ) to each springbar (or attaching point) in opposite directions with no damage to the watch of attachment point. The bracelet of the watch being tested shall be closed.

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-Shock Mudman wristwatchMudman
They 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 water resistance.

Water resistance

The WR mark on a wristwatch indicating its ability to withstand exposure to water