Scientists have to measure things accurately or else science would be pointless,
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Scientists use laboratory tools to help them examine and observe things accurately and with basis. Microscope is one of the tools that scientists use because without the help of microscopes, scientists cannot see bacteria using their naked eye.
...prove hypotheses, for one.
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Tools enable scientists to make more accurate observations, and to observe things that they otherwise could not observe. For example, microscopes allow scientists to observe bacteria, which otherwise are too small to see.