The bottom of the tide clock dial (6 o’clock position) is marked “low tide” and the top of the tide clock dial (12 o’clock position) is marked “high tide.” The left side of the dial is marked “hours until high tide” and has a count-down of hours from 5 to 1. There is one hand on the clock face, and along the left side it points to the number of hours “until” the (lunar) high tide. The right hand side of the clock is marked “hours until low tide” and has a count-down of hours from 5 to 1. The number pointed to by the hand gives the time “until” the (lunar) low tide. Some tide clocks incorporate time (using standard quartz movement) and even humidity and temperature in the same instrument.