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Pre-Historic Life Folding Ruler - 5 Billion Years of History of Planet Earth
Cambrian to Quaternary - Five billion years of evolution in a folding one meter rule
Easy to use and oh, so educational
Made of real oak wood , the ruler unfolds to measure up to 1 meter long (Approx 39 inches)
Folds down to a pencil case or pocket sized 24cm (9.5inches)