What is time? A complicated question that can be attempted with the use of a Classroom Sand Timer. Time is a difficult concept even for adults but a school Sand Timer provides children a visual practical and concrete representation of passing time.Show children there was a time before wristwatches smartphones and clocks!Use as an activity starter and finisher; classroom tidy in 30 seconds? Done.Incorporate a Sand Timer for the classroom into your arsenal of behaviour management strategies by giving pupils a 30 second warning for quiet or 30 seconds to reset and reboot.