give reason -
while taking reading from a ruler the eye myst be exactly vertically above the nark to be read.
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In ruler there are many small lines between 2 numbers and if your reading is 6.8 then it might be possible that you mark 6.7 or 6.9 instead of 6.8. because your line of sight makes you to believe that what you are seeing is correct but actually it is wrong.
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