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Certina sport watches set the standard in water resistance.

In water sports, a timepiece with a minimum water resistance of 100 meters is recommended. All Certina sport watches are equipped with either the 'DS' or 'DS+' system, and tested at a minimum pressure of 10 atmospheres (equivalent to a depth of 100 meters** at sea level) in accordance with the ISO 6425 standard.

Every Certina must undergo a series of tests for water resistance before it reaches the sales outlet. The first test places the timepiece under high air pressure, to ensure that air cannot find its way into the watch housing. The following test takes it through wide temperature variations in a damp environment, to ensure the total absence of water condensation inside the watch glass. The final hurdle which must be overcome by every Certina is the diving test: several hours under water at high pressure, to simulate the depth for which the watch has been certified, and guaranteed to withstand.

**Important! The water resistance rating of our watches is based upon laboratory pressure tests, comparable to the pressure conditions to which an unmoving swimmer or diver may be exposed at the corresponding depth in a wide range of water sports, and may show some variation. The conditions under which the timepiece is tested represent a basis for minimum protection that a water-resistant watch should give, and may vary in such cases where strong or intense movements occur.

It should also be understood that water resistance cannot be guaranteed for an indefinite length of time. It may become compromised by accidental shock or impact to the crown, push-button or other areas. For this reason, we recommend that you have your timepiece checked for water resistance by an authorised Certina Service Centre annually, and have any faulty component replaced, if necessary. One should not, under any circumstance, attempt to open a complex, modern watch on one's own.