Certina DS Action ChronographCertina DS Action Chronograph The Certina DS Action Chronograph is built for those who push limits on the water, in the mountains, or wherever the day takes them. Its 42 mm stainless steel case carries Certina's legendary DS (Double Security) concept, engineered to withstand the unexpected with 300 m of water resistance and a construction that refuses to compromise. The deep black dial commands attention without asking for it. A Swiss quartz movement