What an HPLC actually does, and why labs have so many
HPLC is how a lab finds out what is in a liquid and how much. It is the workhorse of analytical chemistry, which is why used modules are everywhere.
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explainer
What an atomic force microscope actually does
An AFM does not use light. It feels the surface with a needle a few atoms wide. Here is how it works, what it is used for, and who buys one.