Time always running away from you? A 30 Minute Classroom Sand Timer can not only help you teach time but it can help you to nail your lesson timings. Sand Timers for schools support children's understanding as they provide a visual practical and concrete representation especially when used with other Classroom Sand Timers of different lengths of time.Time segments and activities and ensure you keep the timings of your lessons.Help young children grasp the complicated concept of time using a concrete resource.Use to support problem solving reasoning and cooperative skills by timing group work.