Is the Certina DS Action Diver 40.5mm worth it?

Yes, if you want a certified Swiss automatic diver without paying luxury prices. It delivers sapphire, 300m water resistance and ISO 6425 specs at an entry-level price.

How does the 40.5mm compare with the 38mm and 43mm versions?

The 40.5mm is the middle size and suits most wrists. The 38mm is better for smaller wrists, and the 43mm wears noticeably larger and heavier.

What is the water resistance and can I swim with it?

It is rated to 300m and is ISO 6425 certified, so swimming, snorkeling and recreational diving are fine. Rinse it with fresh water after saltwater use.

Does it have a sapphire crystal?

Yes. The crystal is sapphire and scratch-resistant, which is unusual at this price.

What is the power reserve?

The automatic movement has roughly 80 hours of power reserve. That means it keeps running through a weekend off the wrist.

Certina divers tend to drop during seasonal sales and around major shopping events. Watch the price history and buy when it sits near the low end of its recent range.

Certina DS Action Diver 40.5mm

Last price we saw

$900.00at Macy's, last seen Nov 2

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Our take on the Certina DS Action Diver 40.5mm

The Certina DS Action Diver is a Swiss automatic dive watch built for daily wear and real water use. It pairs a stainless steel case with a unidirectional dive bezel, a screw-down crown and a sapphire crystal, and it carries ISO 6425 dive-watch certification. The 40.5mm model sits between Certina's smaller 38mm and larger 43mm versions, so it fits most wrists without looking oversized. Its price sits in the entry-level Swiss diver bracket, and the latest best price is close to the low end of its recent range.

Best forFirst Swiss automatic dive watchDaily wear with swimming and snorkelingBuyers who want ISO-rated dive specs on a budget