Ratio FreeDiver Helium-Safe 1000M Sapphire Automatic 1068HA90-34VA-WHT Men's Watch An analogue dive watch that becomes essential diving equipment when you don’t have a dive computer. With a dive computer, it stays as a backup device. Plus, a dive computer is unnecessary for freediving or fun-diving. This analog dive watch shall tell you how long you have been in water and your actual dive-time. That’s when you don’t wear it on a regular day at the city.