The unit of measure, inches, cm, PSI, etc.
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answer question introduction to management science quantitative approaches to decision making
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Eye-Balling? Rough Guess? Educated guess?
A kilometre is a measure of distance. A millilitre is a measure of capacity. The two units are therefore incompatible.
Write down your measurement. Check what you have written. Repeat. There are other things, like making sure nothing is interfering with your measurement (such as the action of taking the reading), or your experiment (varying temperature, draughts, magnets...)