Learning Resources Primary Time Teacher Demonstration 24-Hour Clock. This brightly coloured clock will engage young children as they develop an understanding of time. This demonstration clock has been designed specifically with teaching time in mind. Colour coded with blue minutes and minute hand and red hours and hour hand, this demonstration clock is geared so that the hands move in accurate increments. This teaching clock will develop an understanding of analogue time telling with the clock face but also features a window showing the corresponding digital time and AM or PM. This window can be hidden for assessment purposes. Clock measures 39cm H. Suitable for ages 3+.