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EM grids are generally used in TEM.
A TEM grid is a thin 3.05 mm disk with mesh or other shaped holes used to support thin sections of sample.
this mesh allows for fine sections (see photo) of samples to be observed under TEM.
In general, 200-400 mesh (lines/in) grids are used in TEM experiments.
Most EM grids are made of copper because it is non-ferromagnetic and thus minimally distorts the magnetic field of the objective lens.