Medallion Tide Clock by Downeaster

The Medallion Tide Clock by Downeaster tide clock utilizes a battery-operated movement that keeps lunar time relating to the movement of the tides-12 hours 25 minutes. An easy-to-read dial indicates time to high and low tides, as well as to the ebbing and flooding half tides. Set this clock to wherever you want to track the average tide cycle-for example, your favorite beach, harbor, or fishing area. Five year warranty. Brushed Nickel case available for $20 extra. 

More information about Tides and Tide Clocks.