Imaris
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Who would believe you?
Also, you are actually wrong because usually, a ruler has some free space from the scale, which also needs to be measured to calculate the total length of the ruler. And also, the ruler might not be accurate; you can measure the length with a more accurate tool.
Also, you are actually wrong because usually, a ruler has some free space from the scale, which also needs to be measured to calculate the total length of the ruler. And also, the ruler might not be accurate; you can measure the length with a more accurate tool.