Finally! A practical tide clock for sea glass hunters . This tide clock can be set to the tide at your favorite collection site and will accurately predict the tide change. And the sea level changes in the picture in sync with the tide. This crab is an expert, though, so better get up early before it’s all gone! The Sea Glass Hunter’s Tide Clock can be used anywhere there are two regular high and low tides per day. Precision tide movement with mechanically animated display, measuring 11" high x 6.5" wide x 2 "deep.