Toy! Two Way Water Sand Hourglass (Blue, Yellow)

! A sand timer is a centuries-old device that uses sand and gravity to measure time. In this ingenious G.W. Schleidt design, inspired by 17th century physicist Isaac Newton, the sand timer is suspended in a clear liquid within a glass cylinder. When the apparatus is inverted, the sand slowly trickles downward within the sand timer. ! A modern take on a centuries-old device for measuring time.Beautiful blue and red sand. A beautifully decorated.Educational and fun for all ages. age: 5 years and up Do not put in the mouth.Best Wishes Foryou. Thanks to subsidies !