Most fishermen agree that fish bite better two hours before or after high tide. The Fishing Tide Clock's cycle is set for semi-diurnal tides-two highs and lows a day (i.e., a high or low tide approximately every 6 hours 12 minutes). This instrument's easy-to-read dial displays time to high and low tides, as well as to the ebbing and flooding half tides. A gradation around the scale indicates best fishing times. This model has the Striped Bass face plate enclosed in a highly polished Brass Case.