Gilder TEM Finder Grids

G100F1
     - Each of the 60 grid squares is identified using a base two binary numbering system.
     - The six binary number symbols appear on the bottom grid bars along the horizontal axis.
     - Zero is represented by a short pillar and One is represented by a longer pillar.
     - 100 Mesh
     - Pitch 250μm 
     - Bar Width 40μm
     - Hole Width 210μm 

G200F1
     - An alpha-numerical code identifies 48 blocks of 6 grid squares, delineated by thicker grid bars.
     - Each Block's code is attached to the baseline of its center-bottom cell, letters representing rows and numbers representing columns.
     - 200 Mesh
     - Pitch 125μm 
     - Bar Width 25 to 35μm
     - Hole Width 90 to 100μm 

G200F2
     - Alphabetic identification of 24 blocks of nine grid squares.
     - The letter is built into the center grid square of each block.
     - 200 Mesh
     - Pitch 125μm 
     - Bar Width 12 to 25μm
     - Hole Width 106μm 

G200HF3
     - An alphanumeric code uniquely identifies 322 grid squares.
     - 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 grid square. The column number is indicated by a binary coding symbol attached to the baseline of the cell.
     - 200 Mesh
     - Pitch 125μm 
     - Bar Width 10 to 20μm
     - Hole Width 105 to 115μm 

G200F4
     - Each grid rectangle is asymmetrical, having different outlines in each corner.
     - The index feature enables the position of each grid square to be identified by reference to the letters and numbers.
     - 200 to 250 Mesh
     - Pitch 105 to 125μm
     - Bar Width 15 to 20μm
     - Hole Width 90 to 105μm 

G300F1
     - All 625 individual cells are divided into 25 sets bounded by thicker crenellated bars.
     - Each set of 25 (5x5) cells have a central alphabet letter from A through Y for identification purposes.
     - 300 Mesh
     - Pitch 83μm +/-0.5μm
     - Bar Width 20μm
     - Hole Width 63μm  

G400F1
     - All 1152 (32x36) individual cells are divided into 32 sets bounded by thicker crenellated bars.
     - Each set of 32 (6x6) cells have a central number from 1 through 32 for identification purposes.
     - 400 Mesh
     - Pitch 62μm +/-0.5μm
     - Bar Width 15μm
     - Hole Width 47μm