They could use an electron microscope or an STM (scanning tunneling microscope)
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a tool which.......................................................
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Glass
Chemists use a triple beam balance to weigh things, astronomers use telescopes to observe very distant things, biologists use microscopes to observe very small things, and there are literally thousands of other tools used by scientists in various different specialties.
Usually, a scanning electron microscope is used to observe atoms.
clay it really depends on what they are making
It is fitted on to the end of a pipette, a graduated glass tube used to measure varying volumes of liquid, and is used to draw up the liquid safely.
The wavelength of light used to observe an object must be shorter than the size of the object itself.