Robust colour coded sand timers giving accurate internal times for individual pupil use. Perfect for use in games and timing experiments. Contains 30s, 1m, 3m, 5m and 10m timers.Specification:Size 100 x 25mm. Pack of 5.
Robust colour coded sand timers giving accurate internal times for individual pupil use. Perfect for use in games and timing experiments. Contains 30s, 1m, 3m, 5m and 10m timers.Specification:Size 100 x 25mm. Pack of 5.
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