Mega Sand Timer SetMega sand timer with moulded end caps and shatterproof plastic barrier to protect the inner glass. Sand timers offer a traditional visual demonstration of the passing of time. Easy for young children to understand and ideal for use in timed games, for timing experiments & completing tests, or to measure specific periods of time for activities such as reading, creative writing or tidying up. Sand timers are colour coded, Green = 1 Minute, Yellow = 3