Hourglass

Large, virtually indestructible hourtimers have moulded end caps and thick wall surrounds. The Hourglass translate abstract time into concrete time. They are ideal for use with children where the passage of time for staying 'on-task' etc. is hard to grasp. The glasses are available in a selection of different time durations.
When is the treatment finished? For how long time should I brush my teeth?

Time: 1, 3, 5, 10, 15, 30 minutes
Size: 5 inches