Ako ga testiraju na licu mesta onda imaju aparate ali ako ti kaže pozvađemo vas onda ga šalju tom istom časovničaru gde si već bio Terazije br. 5. ali i on ima previše posla pa ponekada kaže da nema takvo testiranje.
I oni mogu da zamene gumice kao i pola časovničara u Beogradu, naruče ih pa ugrade i naplate isto ali si kod ovog časovničara gde si već bio si miran jer znaš da je ugradio orginal jer gubi licencu ako ugradi nešto što ne treba.

Najbolje je da okreneš brojeve telefona i pitaš da li u njihovom servisu vrše testiranje gumica, bilo kojeg časovničara u Beogradu, Link. Ali ako čuvaš tako sat ne vidim toliki razlog za tako hitnim menjanjem i ako bi trebalo. Ali ako sada nemaš para da ulažeš u sat zamenićeš ih vremenom, postavi samo novu bateriju. Kažem ti, Certina je odradila odličan posao tim patentom ali i sama naglašava da se vremenom vodootpornost gubi u satu!

WATER RESISTANCE
Certina sport watches set the standard in water resistance. In water sports, a timepiece with a minimum water resistance of 10 bar (100 m) is recommended. All Certina sport watches are equipped with the ‘DS’ concept, and tested to a minimum pressure of 10 bar (equivalent to a depth of 100 m) 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. For this reason, we recommend that you have the timepiece checked for water resis-tance by an authorised Certina Service agent annually, and have any faulty components replaced. Do not attempt to open the timepiece yourself under any circumstances.