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1 cm is the 1st significant digit on this cm ruler.

0.1 cm (= 1 mm) is the 2nd, 0.01 cm is the 3rd and finally

0.001 cm (= 0.010 mm =10 mu) gives you the shortest measurable distance in FOUR significant figures, this means it is accurate to measure difference between 0.001 and 0.002 cm

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9y ago
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Q: What is the shortest length that could be measured with a cm ruler that would contain four significant figures?
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