Certina sport watches set the standard in water resistance. For water sports, a timepiece with a minimum water resistance of 10 bar (100 m) is recommended. All Certina sports watches are equipped with the "DS" concept and tested to a minimum pressure of 10 bar in accordance with the relevant ISO standards.

It should also be understood that water resistance cannot be guaranteed for an indefinite length of time. It may become compromised by ageing of the seals or impacts to the crown or push-button. Certina therefore recommends that you have the timepiece checked for water resistance by an authorised Certina Service agent annually, and have any faulty components replaced. Do not attempt to open the timepiece yourself under any circumstances.