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There may be some variety of different patterns to choose from, but the one thing they all have in common is that they are used by microscopists who want to be able to return, at a later time, to the same identical grid square, to examine a previously examined feature, perhaps even by a different person.
For those doing TEM work and using in their work "index" or "finder" grids, the selection of the pattern is almost more a matter of what one has gotten used to than anything else. Of course for specific types of work one pattern might have advantages over the others. For example, for asbestos work the most widely used grid in the world is the SPI asbestos index grid. But other worker prefer to have the index markings closer to the grid square being examined, and they prefer the "Micron" style asbestos index grid.
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SPI Index Grids for Quantitative TEM studies - 200 Mesh "Only" SPI Calibrated Asbestos Index Grids For AHERA Requirements |
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| Micron™ Asbestos Index Grids made by SPI Supplies/CANADA |  |
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| Other Index Grids |
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| Gilder Pattern Index Grids |  |
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| Gilder TEM Binary System Finder Grid - G100F1 |  |
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| Index Grids from Pyser-SGI (Formerly Graticules, Ltd.) |  |
