Ratio FreeDiver Professional 500M Sapphire Automatic 32BJ202A-BLK Men's Watch 

The Ratio Free diver watch will let you know precisely how much time you have underwater and for how long have you been there right at one glance. It has a reliable durability and its construction is critical. A well-built case, a strong crystal (sapphire) and a movement that has been created to handle physical stress, it is a solid dive watch that will last for decades with minimal maintenance and will qualify as an heirloom.