TEM Grids, Finder, 200 Mesh, square, Cu, 25 pieces

322 cells are uniquely identified by an alphanumeric code. At light microscope level, this code can be referenced from the letters and numbers on the rim of the grid, representing rows and columns respectively. At the electron microscope level, the row letter is indicated by a symbol to the bottom left of the cell. The column number is indicated by a binary coding attached to the baseline of the cell.