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Most normal rulers will not have graduations that are fine enough. You will find numbered marks for 2 and 3 (centimetres - or inches if you still use those). There will be ten smaller divisions between them representing tenths so 2.1, 2.2 and so on. The fifth division - for 2.5 - may be a slightly longer line. 2.45 is halfway between 2.4 and 2.5.
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