BUY BEST DIVER WATCH WHAT EXACTLY IS IT? A dive watch is a specially designed gadget that complies with the ISO 6425 standard. The revolving bezel found on every dive watch is its most distinctive characteristic. There is a spinning component that keeps track of the passing of time all around the dial. It's important to know how long you've been below when diving, especially since the air you're carrying only lasts for so long. Diver’s watches are built more sturdily and with more lasting materials than standard watches.